2ADA:
reference: Atomic structure of adenosine deaminase complexed with a transition-state analog: understanding catalysis and immunodeficiency mutations., Wilson DK, Rudolph FB, Quiocho FA, Science 1991 May 31;252(5010):1278-84. PMID: 1925539

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