1BIR:
reference: A catalytic function for the structurally conserved residue Phe 100 of ribonuclease T1., Doumen J, Gonciarz M, Zegers I, Loris R, Wyns L, Steyaert J, Protein Sci 1996 Aug;5(8):1523-30. PMID: 8844843

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