6RL5:
reference: The crystal structure of the tetrameric DABA-aminotransferase EctB, a rate-limiting enzyme in the ectoine biosynthesis pathway., Hillier HT, Altermark B, Leiros I, FEBS J. 2020 Feb 29. doi: 10.1111/febs.15265. PMID: 32112674

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