Arabidopsis PI encodes the ABC transporter of auxinic compounds including the auxin precursor indole 3 butyric acid
K. Rfeidka, L. Strader, A. Bailly, H. Yang, J. Blakeslee, . angowski, E. Nejedlá, H. Fujita, H. Itoh, K. Sydno, J. Hejátko, W. Gray, E. Martinoia, M. Geisler, B. Bartel, A. Murphy, J. Friml, PNAS 107 (2010) 10749–10753.