5Y01:
reference: Acid-Tolerant Monomeric GFP from Olindias formosa., Shinoda H, Ma Y, Nakashima R, Sakurai K, Matsuda T, Nagai T, Cell Chem Biol. 2017 Dec 23. pii: S2451-9456(17)30432-4. doi:, 10.1016/j.chembiol.2017.12.005. PMID: 29290624

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