4GQY:
reference: Change in single cystathionine beta-synthase domain-containing protein from a bent to flat conformation upon adenosine monophosphate binding., Jeong BC, Park SH, Yoo KS, Shin JS, Song HK, J Struct Biol. 2013 Jul;183(1):40-6. doi: 10.1016/j.jsb.2013.04.013. Epub 2013, May 9. PMID: 23664870

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