Kurauskas, Vilius, et al. “Methyl-Specific Isotope Labeling Strategies for NMR Studies of Membrane Proteins.”10.1007/978-1-4939-7151-0_6__Membrane Protein Structure and Function Characterization, vol. 1635, Springer Nature, 2017, pp. 109–23, doi:10.1007/978-1-4939-7151-0_6.