6IZ9:
reference: Crystal structure of the apo form of a beta-transaminase from Mesorhizobium sp. strain LUK., Kwon S, Park HH, Protein Sci. 2019 Feb 25. doi: 10.1002/pro.3594. PMID: 30805955

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