4WGF:
reference: Crystal Structure of a Hidden Protein, YcaC, a Putative Cysteine Hydrolase from Pseudomonas aeruginosa, with and without an Acrylamide Adduct., Groftehauge MK, Truan D, Vasil A, Denny PW, Vasil ML, Pohl E, Int J Mol Sci. 2015 Jul 14;16(7):15971-84. doi: 10.3390/ijms160715971. PMID: 26184183

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