1QNL:
reference: Structural adaptation to selective pressure for altered ligand specificity in the Pseudomonas aeruginosa amide receptor, amiC., O'Hara BP, Wilson SA, Lee AW, Roe SM, Siligardi G, Drew RE, Pearl LH, Protein Eng 2000 Feb;13(2):129-32. PMID: 10708652

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