6HPO:
reference: Structure of full-length human phenylalanine hydroxylase in complex with tetrahydrobiopterin., Flydal MI, Alcorlo-Pages M, Johannessen FG, Martinez-Caballero S, Skjaerven L, Fernandez-Leiro R, Martinez A, Hermoso JA, Proc Natl Acad Sci U S A. 2019 May 22. pii: 1902639116. doi:, 10.1073/pnas.1902639116. PMID: 31118288

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).