- Phenylalanine 90 and 93 are localized within the phenol binding site of human UDP-glucuronosyltransferase 1A10 as determined by photoaffinity labeling, mass spectrometry, and site-directed mutagenesis. Xiong, Y., Bernardi, D., Bratton, S., Ward, M.D., Battaglia, E., Finel, M., Drake, R.R., Radominska-Pandya, A. Biochemistry (2006)