1NRF:
reference: Crystal structure of the sensor domain of the BlaR penicillin receptor from Bacillus licheniformis., Kerff F, Charlier P, Colombo ML, Sauvage E, Brans A, Frere JM, Joris B, Fonze E, Biochemistry 2003 Nov 11;42(44):12835-43. PMID: 14596597

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