---
APC_amount: 3948 EUR
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OA_place: publisher
OA_type: gold
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abstract:
- lang: eng
  text: Prenatal immune challenges pose significant risks to human embryonic brain
    and eye development. However, our knowledge about the safe usage of anti-inflammatory
    drugs during pregnancy is still limited. While human induced pluripotent stem
    cells (hIPSC)-derived brain organoid models have started to explore functional
    consequences upon viral stimulation, these models commonly lack microglia, which
    are susceptible to and promote inflammation. Furthermore, microglia are actively
    involved in neuronal development. Here, we generate hIPSC-derived microglia precursor
    cells and assemble them into retinal organoids. Once the outer plexiform layer
    forms, these hIPSC-derived microglia (iMG) fully integrate into the retinal organoids.
    Since the ganglion cell survival declines by this time in 3D-retinal organoids,
    we adapted the model into 2D and identify that the improved ganglion cell number
    significantly decreases only with iMG presence. In parallel, we applied the immunostimulant
    POLY(I:C) to mimic a fetal viral infection. While POLY(I:C) exposure alters the
    iMG phenotype, it does not hinder their interaction with ganglion cells. Furthermore,
    iMG significantly enhance the supernatant’s inflammatory secretome and increase
    retinal cell proliferation. Simultaneous exposure with the non-steroidal anti-inflammatory
    drug (NSAID) ibuprofen dampens POLY(I:C)-mediated changes of the iMG phenotype
    and ameliorates cell proliferation. Remarkably, while POLY(I:C) disrupts neuronal
    calcium dynamics independent of iMG, ibuprofen rescues this effect only if iMG
    are present. Mechanistically, ibuprofen targets the enzymes cyclooxygenase 1 and
    2 (COX1/PTGS1 and COX2/PTGS2) simultaneously, from which iMG mainly express COX1.
    Selective COX1 blockage fails to restore the calcium peak amplitude upon POLY(I:C)
    stimulation, suggesting ibuprofen’s beneficial effect depends on the presence
    and interplay of COX1 and COX2. These findings underscore the importance of microglia
    in the context of prenatal immune challenges and provide insight into the mechanisms
    by which ibuprofen exerts its protective effects during embryonic development.
acknowledged_ssus:
- _id: LifeSc
- _id: Bio
acknowledgement: We thank the scientific service units at ISTA, specifically the Lab
  Support Facility (LSF), the Molecular Biology Services/Virus Services Team, specifically
  Flavia Gama Gomes Leite and Mark Andrew Smyth, for the virus production, and the
  Imaging and Optics Facility (IOF). We thank all members of the Siegert group and
  Marco Benevento for their constant feedback on the project and comments on the manuscript.
  A special thanks to Rouven Schulz for input on statistical analysis and sharing
  R-scripts, Gloria Colombo for the introduction to cell sorting, Negar Vehdani and
  Florianne Schoot Uiterkamp for their support in cell culture. This research was
  supported by the Gesellschaft für Forschungsförderung Niederösterreich (grant No.
  Sc19-017 to V.H.).
article_number: '98'
article_processing_charge: Yes
article_type: original
author:
- first_name: Verena
  full_name: Hübschmann, Verena
  id: 32B7C918-F248-11E8-B48F-1D18A9856A87
  last_name: Hübschmann
- first_name: Medina
  full_name: Korkut, Medina
  id: 4B51CE74-F248-11E8-B48F-1D18A9856A87
  last_name: Korkut
  orcid: 0000-0003-4309-2251
- first_name: Alessandro
  full_name: Venturino, Alessandro
  id: 41CB84B2-F248-11E8-B48F-1D18A9856A87
  last_name: Venturino
  orcid: 0000-0003-2356-9403
- first_name: Juan Pablo
  full_name: Maya-Arteaga, Juan Pablo
  id: c815d433-1f5d-11f0-a875-dad18b1e5924
  last_name: Maya-Arteaga
- first_name: Sandra
  full_name: Siegert, Sandra
  id: 36ACD32E-F248-11E8-B48F-1D18A9856A87
  last_name: Siegert
  orcid: 0000-0001-8635-0877
citation:
  ama: Schmied V, Korkut M, Venturino A, Maya-Arteaga JP, Siegert S. Microglia determine
    an immune-challenged environment and facilitate ibuprofen action in human retinal
    organoids. <i>Journal of Neuroinflammation</i>. 2025;22(1). doi:<a href="https://doi.org/10.1186/s12974-025-03366-x">10.1186/s12974-025-03366-x</a>
  apa: Schmied, V., Korkut, M., Venturino, A., Maya-Arteaga, J. P., &#38; Siegert,
    S. (2025). Microglia determine an immune-challenged environment and facilitate
    ibuprofen action in human retinal organoids. <i>Journal of Neuroinflammation</i>.
    Springer Nature. <a href="https://doi.org/10.1186/s12974-025-03366-x">https://doi.org/10.1186/s12974-025-03366-x</a>
  chicago: Schmied, Verena, Medina Korkut, Alessandro Venturino, Juan Pablo Maya-Arteaga,
    and Sandra Siegert. “Microglia Determine an Immune-Challenged Environment and
    Facilitate Ibuprofen Action in Human Retinal Organoids.” <i>Journal of Neuroinflammation</i>.
    Springer Nature, 2025. <a href="https://doi.org/10.1186/s12974-025-03366-x">https://doi.org/10.1186/s12974-025-03366-x</a>.
  ieee: V. Schmied, M. Korkut, A. Venturino, J. P. Maya-Arteaga, and S. Siegert, “Microglia
    determine an immune-challenged environment and facilitate ibuprofen action in
    human retinal organoids,” <i>Journal of Neuroinflammation</i>, vol. 22, no. 1.
    Springer Nature, 2025.
  ista: Schmied V, Korkut M, Venturino A, Maya-Arteaga JP, Siegert S. 2025. Microglia
    determine an immune-challenged environment and facilitate ibuprofen action in
    human retinal organoids. Journal of Neuroinflammation. 22(1), 98.
  mla: Schmied, Verena, et al. “Microglia Determine an Immune-Challenged Environment
    and Facilitate Ibuprofen Action in Human Retinal Organoids.” <i>Journal of Neuroinflammation</i>,
    vol. 22, no. 1, 98, Springer Nature, 2025, doi:<a href="https://doi.org/10.1186/s12974-025-03366-x">10.1186/s12974-025-03366-x</a>.
  short: V. Schmied, M. Korkut, A. Venturino, J.P. Maya-Arteaga, S. Siegert, Journal
    of Neuroinflammation 22 (2025).
corr_author: '1'
date_created: 2025-04-20T22:01:28Z
date_published: 2025-04-03T00:00:00Z
date_updated: 2026-08-12T08:45:16Z
day: '03'
ddc:
- '570'
department:
- _id: SaSi
doi: 10.1186/s12974-025-03366-x
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title: Microglia determine an immune-challenged environment and facilitate ibuprofen
  action in human retinal organoids
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abstract:
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  text: "Prenatal immune challenges pose significant risks to human embryonic brain
    and eye development. However, we still lack knowledge about the safe usage of
    anti-inflammatory drugs during pregnancy. Human induced pluripotent stem cell
    (hIPSC)-derived brain organoid models provide a unique opportunity to investigate
    neuronal development and have started to explore functional consequences upon
    viral infection. However, brain organoids usually lack microglia, the brain-resident
    immune cells. They are present in the early human embryonic brain and actively
    participate in neuronal circuit development. At the same time, microglia are known
    for their immune-sensing properties and will influence viral-mediated effects.
    In my thesis, I was interested to study the multifunctional role of human microglia
    during retinal development. \r\nIn chapter 1, I characterize the innate occurrence
    of IBA1+-microglia-like cells within the retinal organoid differentiation (Bartalska
    et al., 2022). Therefore, we differentiate hIPSC using an unguided retinal organoid
    differentiation protocol and observe the presence of IBA1+-microglia-like cells
    alongside retinal cups between week 3 and 4 in 2.5D culture. However, instead
    of infiltrating the neuroectodermal sides, they enrich within non-pigmented, 3D-cystic
    compartments that develop in low numbers parallel to 3D-retinal organoids. To
    enrich for IBA1+-microglia precursors (preMG), we guided the differentiation with
    a low-dosed BMP4 application, which prevents retinal cup development and enhances
    microglia and 3D-cysts formation. We characterize the differentiated preMG for
    their microglia-like identity and validated their functionality. In parallel,
    mass spectrometry identifies the 3D-cysts to express mesenchymal and epithelial
    markers. We confirm that comparable 3D-cysts are also the preferential environment
    for IBA1+-microglia-like cells within the unguided retinal organoid differentiation.
    \r\nIn chapter 2, I investigate how microglia influence retinal development and
    whether they contribute to viral-mediated consequences (Schmied et al., 2025).
    Here, we assemble preMG, which we have characterized in chapter 1, into 3D-retinal
    organoids. Once the outer plexiform layer forms, microglia-like cells (iMG) populate
    them and interact with retinal cell types. However, at this developmental stage,
    the ganglion cell number decreases in 3D-retinal organoids. Thus, we adapted the
    model into 2D which promotes their survival. Integrated iMG engulf ganglion cells
    and control their cell number. In parallel, we apply the immunostimulant POLY(I:C)
    to mimic a fetal viral infection. Although POLY(I:C) stimulation affects iMG phenotype,
    it does not influence their interaction with ganglion cells. Furthermore, iMG
    presence significantly contributes to the supernatant’s inflammatory secretome
    and increases retinal cell proliferation. Simultaneous exposure to the non-steroidal
    anti-inflammatory drug (NSAID) ibuprofen dampens POLY(I:C)-mediated consequences
    of the iMG phenotype and ameliorates cell proliferation. Remarkably, while POLY(I:C)
    disrupts neuronal calcium dynamics independent of iMG presence, ibuprofen rescues
    this effect only in the presence of iMG. Mechanistically, ibuprofen blocks the
    enzymes cyclooxygenase 1 and 2 (COX1/ PTGS1 and COX2/ PTGS2) simultaneously, from
    which iMG predominantly express COX1. Selective inhibition of COX1 does not restore
    the calcium peak amplitude upon POLY(I:C) stimulation, indicating ibuprofen’s
    effect depends on the presence and interplay of both, COX1 and COX2. \r\nIn summary,
    we characterized the 3D-retinal organoid model for the occurrence of IBA1+-microglia
    like cells. As the innately developing IBA1+-cells enrich in mesenchymal over
    retinal structures, we optimized a protocol to differentiate IBA1+-microglia precursors.
    By combining these two models we generate microglia-assembled retinal organoids.
    Our results underscore the importance of microglia during neurodevelopment, in
    the context of prenatal immune challenges and provide insight into the mechanisms
    by which ibuprofen exerts its protective effects during embryonic development."
alternative_title:
- ISTA Thesis
article_processing_charge: No
author:
- first_name: Verena
  full_name: Hübschmann, Verena
  id: 32B7C918-F248-11E8-B48F-1D18A9856A87
  last_name: Hübschmann
citation:
  ama: Schmied V. Human microglia impact neuronal development in retinal organoids.
    2025. doi:<a href="https://doi.org/10.15479/AT-ISTA-20074">10.15479/AT-ISTA-20074</a>
  apa: Schmied, V. (2025). <i>Human microglia impact neuronal development in retinal
    organoids</i>. Institute of Science and Technology Austria. <a href="https://doi.org/10.15479/AT-ISTA-20074">https://doi.org/10.15479/AT-ISTA-20074</a>
  chicago: Schmied, Verena. “Human Microglia Impact Neuronal Development in Retinal
    Organoids.” Institute of Science and Technology Austria, 2025. <a href="https://doi.org/10.15479/AT-ISTA-20074">https://doi.org/10.15479/AT-ISTA-20074</a>.
  ieee: V. Schmied, “Human microglia impact neuronal development in retinal organoids,”
    Institute of Science and Technology Austria, 2025.
  ista: Schmied V. 2025. Human microglia impact neuronal development in retinal organoids.
    Institute of Science and Technology Austria.
  mla: Schmied, Verena. <i>Human Microglia Impact Neuronal Development in Retinal
    Organoids</i>. Institute of Science and Technology Austria, 2025, doi:<a href="https://doi.org/10.15479/AT-ISTA-20074">10.15479/AT-ISTA-20074</a>.
  short: V. Schmied, Human Microglia Impact Neuronal Development in Retinal Organoids,
    Institute of Science and Technology Austria, 2025.
corr_author: '1'
date_created: 2025-07-24T12:37:22Z
date_published: 2025-07-24T00:00:00Z
date_updated: 2026-08-12T08:45:16Z
day: '24'
ddc:
- '570'
degree_awarded: PhD
department:
- _id: GradSch
- _id: SaSi
doi: 10.15479/AT-ISTA-20074
doi_confirm: '1'
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  grant_number: SC19-017
  name: How human microglia shape developing neurons during health and inflammation
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  issn:
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publication_status: published
publisher: Institute of Science and Technology Austria
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supervisor:
- first_name: Sandra
  full_name: Siegert, Sandra
  id: 36ACD32E-F248-11E8-B48F-1D18A9856A87
  last_name: Siegert
  orcid: 0000-0001-8635-0877
title: Human microglia impact neuronal development in retinal organoids
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type: dissertation
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
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...
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_id: '12117'
abstract:
- lang: eng
  text: "To understand how potential gene manipulations affect in vitro microglia,
    we provide a set of short protocols to evaluate microglia identity and function.
    We detail steps for immunostaining to determine microglia identity. We describe
    three functional assays for microglia: phagocytosis, calcium response following
    ATP stimulation, and cytokine expression upon inflammatory stimuli. We apply these
    protocols to human induced-pluripotent-stem-cell (hiPSC)-derived microglia, but
    they can be also applied to other in vitro microglial models including primary
    mouse microglia.\r\nFor complete details on the use and execution of this protocol,
    please refer to Bartalska et al. (2022).1"
acknowledged_ssus:
- _id: Bio
acknowledgement: This project has received funding from the European Research Council
  (ERC) under the European Union’s Horizon 2020 research and innovation program (grant
  No. 715571 to S.S.) and from the Gesellschaft für Forschungsförderung Niederösterreich
  (grant No. Sc19-017 to V.H.). We thank Rouven Schulz and Alessandro Venturino for
  their insights into functional assays and data analysis, Verena Seiboth for insights
  into necessary institutional permission, and ISTA imaging & optics facility (IOF)
  especially Bernhard Hochreiter for their support.
article_number: '101866'
article_processing_charge: No
article_type: letter_note
author:
- first_name: Verena
  full_name: Hübschmann, Verena
  id: 32B7C918-F248-11E8-B48F-1D18A9856A87
  last_name: Hübschmann
- first_name: Medina
  full_name: Korkut, Medina
  id: 4B51CE74-F248-11E8-B48F-1D18A9856A87
  last_name: Korkut
  orcid: 0000-0003-4309-2251
- first_name: Sandra
  full_name: Siegert, Sandra
  id: 36ACD32E-F248-11E8-B48F-1D18A9856A87
  last_name: Siegert
  orcid: 0000-0001-8635-0877
citation:
  ama: Hübschmann V, Korkut M, Siegert S. Assessing human iPSC-derived microglia identity
    and function by immunostaining, phagocytosis, calcium activity, and inflammation
    assay. <i>STAR Protocols</i>. 2022;3(4). doi:<a href="https://doi.org/10.1016/j.xpro.2022.101866">10.1016/j.xpro.2022.101866</a>
  apa: Hübschmann, V., Korkut, M., &#38; Siegert, S. (2022). Assessing human iPSC-derived
    microglia identity and function by immunostaining, phagocytosis, calcium activity,
    and inflammation assay. <i>STAR Protocols</i>. Elsevier. <a href="https://doi.org/10.1016/j.xpro.2022.101866">https://doi.org/10.1016/j.xpro.2022.101866</a>
  chicago: Hübschmann, Verena, Medina Korkut, and Sandra Siegert. “Assessing Human
    IPSC-Derived Microglia Identity and Function by Immunostaining, Phagocytosis,
    Calcium Activity, and Inflammation Assay.” <i>STAR Protocols</i>. Elsevier, 2022.
    <a href="https://doi.org/10.1016/j.xpro.2022.101866">https://doi.org/10.1016/j.xpro.2022.101866</a>.
  ieee: V. Hübschmann, M. Korkut, and S. Siegert, “Assessing human iPSC-derived microglia
    identity and function by immunostaining, phagocytosis, calcium activity, and inflammation
    assay,” <i>STAR Protocols</i>, vol. 3, no. 4. Elsevier, 2022.
  ista: Hübschmann V, Korkut M, Siegert S. 2022. Assessing human iPSC-derived microglia
    identity and function by immunostaining, phagocytosis, calcium activity, and inflammation
    assay. STAR Protocols. 3(4), 101866.
  mla: Hübschmann, Verena, et al. “Assessing Human IPSC-Derived Microglia Identity
    and Function by Immunostaining, Phagocytosis, Calcium Activity, and Inflammation
    Assay.” <i>STAR Protocols</i>, vol. 3, no. 4, 101866, Elsevier, 2022, doi:<a href="https://doi.org/10.1016/j.xpro.2022.101866">10.1016/j.xpro.2022.101866</a>.
  short: V. Hübschmann, M. Korkut, S. Siegert, STAR Protocols 3 (2022).
corr_author: '1'
date_created: 2023-01-12T11:56:38Z
date_published: 2022-12-16T00:00:00Z
date_updated: 2025-06-11T13:58:47Z
day: '16'
ddc:
- '570'
department:
- _id: SaSi
- _id: GradSch
doi: 10.1016/j.xpro.2022.101866
ec_funded: 1
external_id:
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  - '36595902'
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intvolume: '         3'
issue: '4'
keyword:
- General Immunology and Microbiology
- General Biochemistry
- Genetics and Molecular Biology
- General Neuroscience
language:
- iso: eng
license: https://creativecommons.org/licenses/by-nc-nd/4.0/
month: '12'
oa: 1
oa_version: Published Version
pmid: 1
project:
- _id: 25D4A630-B435-11E9-9278-68D0E5697425
  call_identifier: H2020
  grant_number: '715571'
  name: Microglia action towards neuronal circuit formation and function in health
    and disease
- _id: 9B99D380-BA93-11EA-9121-9846C619BF3A
  grant_number: SC19-017
  name: How human microglia shape developing neurons during health and inflammation
publication: STAR Protocols
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  issn:
  - 2666-1667
publication_status: published
publisher: Elsevier
quality_controlled: '1'
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scopus_import: '1'
status: public
title: Assessing human iPSC-derived microglia identity and function by immunostaining,
  phagocytosis, calcium activity, and inflammation assay
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abstract:
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  text: Cerebral organoids differentiated from human-induced pluripotent stem cells
    (hiPSC) provide a unique opportunity to investigate brain development. However,
    organoids usually lack microglia, brain-resident immune cells, which are present
    in the early embryonic brain and participate in neuronal circuit development.
    Here, we find IBA1+ microglia-like cells alongside retinal cups between week 3
    and 4 in 2.5D culture with an unguided retinal organoid differentiation protocol.
    Microglia do not infiltrate the neuroectoderm and instead enrich within non-pigmented,
    3D-cystic compartments that develop in parallel to the 3D-retinal organoids. When
    we guide the retinal organoid differentiation with low-dosed BMP4, we prevent
    cup development and enhance microglia and 3D-cysts formation. Mass spectrometry
    identifies these 3D-cysts to express mesenchymal and epithelial markers. We confirmed
    this microglia-preferred environment also within the unguided protocol, providing
    insight into microglial behavior and migration and offer a model to study how
    they enter and distribute within the human brain.
acknowledged_ssus:
- _id: Bio
- _id: LifeSc
acknowledgement: We thank the scientific service units at ISTA, specifically the lab
  support facility and imaging & optics facility for their support; Nicolas Armel
  for performing the Mass Spectrometry. We thank Alexandra Lang and Tanja Peilnsteiner
  for their help in human brain tissue collection, Rouven Schulz for his insights
  into the functional assays We thank all members of the Siegert group for constant
  feedback on the project and Margaret Maes, Rouven Schulz, and Marco Benevento for
  feedback on the manuscript. This project has received funding from the European
  Research Council (ERC) under the European Union’s Horizon 2020 research and innovation
  program (grant No. 715571 to S.S.) and from the Gesellschaft für Forschungsförderung
  Niederösterreich (grant No. Sc19-017 to V.H.).
article_number: '104580'
article_processing_charge: Yes
article_type: original
author:
- first_name: Katarina
  full_name: Bartalska, Katarina
  id: 4D883232-F248-11E8-B48F-1D18A9856A87
  last_name: Bartalska
- first_name: Verena
  full_name: Hübschmann, Verena
  id: 32B7C918-F248-11E8-B48F-1D18A9856A87
  last_name: Hübschmann
- first_name: Medina
  full_name: Korkut, Medina
  id: 4B51CE74-F248-11E8-B48F-1D18A9856A87
  last_name: Korkut
  orcid: 0000-0003-4309-2251
- first_name: Ryan J
  full_name: Cubero, Ryan J
  id: 850B2E12-9CD4-11E9-837F-E719E6697425
  last_name: Cubero
  orcid: 0000-0003-0002-1867
- first_name: Alessandro
  full_name: Venturino, Alessandro
  id: 41CB84B2-F248-11E8-B48F-1D18A9856A87
  last_name: Venturino
  orcid: 0000-0003-2356-9403
- first_name: Karl
  full_name: Rössler, Karl
  last_name: Rössler
- first_name: Thomas
  full_name: Czech, Thomas
  last_name: Czech
- first_name: Sandra
  full_name: Siegert, Sandra
  id: 36ACD32E-F248-11E8-B48F-1D18A9856A87
  last_name: Siegert
  orcid: 0000-0001-8635-0877
citation:
  ama: Bartalska K, Hübschmann V, Korkut M, et al. A systematic characterization of
    microglia-like cell occurrence during retinal organoid differentiation. <i>iScience</i>.
    2022;25(7). doi:<a href="https://doi.org/10.1016/j.isci.2022.104580">10.1016/j.isci.2022.104580</a>
  apa: Bartalska, K., Hübschmann, V., Korkut, M., Cubero, R. J., Venturino, A., Rössler,
    K., … Siegert, S. (2022). A systematic characterization of microglia-like cell
    occurrence during retinal organoid differentiation. <i>IScience</i>. Elsevier.
    <a href="https://doi.org/10.1016/j.isci.2022.104580">https://doi.org/10.1016/j.isci.2022.104580</a>
  chicago: Bartalska, Katarina, Verena Hübschmann, Medina Korkut, Ryan J Cubero, Alessandro
    Venturino, Karl Rössler, Thomas Czech, and Sandra Siegert. “A Systematic Characterization
    of Microglia-like Cell Occurrence during Retinal Organoid Differentiation.” <i>IScience</i>.
    Elsevier, 2022. <a href="https://doi.org/10.1016/j.isci.2022.104580">https://doi.org/10.1016/j.isci.2022.104580</a>.
  ieee: K. Bartalska <i>et al.</i>, “A systematic characterization of microglia-like
    cell occurrence during retinal organoid differentiation,” <i>iScience</i>, vol.
    25, no. 7. Elsevier, 2022.
  ista: Bartalska K, Hübschmann V, Korkut M, Cubero RJ, Venturino A, Rössler K, Czech
    T, Siegert S. 2022. A systematic characterization of microglia-like cell occurrence
    during retinal organoid differentiation. iScience. 25(7), 104580.
  mla: Bartalska, Katarina, et al. “A Systematic Characterization of Microglia-like
    Cell Occurrence during Retinal Organoid Differentiation.” <i>IScience</i>, vol.
    25, no. 7, 104580, Elsevier, 2022, doi:<a href="https://doi.org/10.1016/j.isci.2022.104580">10.1016/j.isci.2022.104580</a>.
  short: K. Bartalska, V. Hübschmann, M. Korkut, R.J. Cubero, A. Venturino, K. Rössler,
    T. Czech, S. Siegert, IScience 25 (2022).
corr_author: '1'
date_created: 2022-07-03T22:01:33Z
date_published: 2022-07-15T00:00:00Z
date_updated: 2026-08-12T08:45:16Z
day: '15'
ddc:
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department:
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doi: 10.1016/j.isci.2022.104580
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title: A systematic characterization of microglia-like cell occurrence during retinal
  organoid differentiation
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