4BLM:
reference: Beta-lactamase of Bacillus licheniformis 749/C. Refinement at 2 A resolution and analysis of hydration., Knox JR, Moews PC, J Mol Biol 1991 Jul 20;220(2):435-55. PMID: 1856867

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