1AH2:
reference: The solution structure of serine protease PB92 from Bacillus alcalophilus presents a rigid fold with a flexible substrate-binding site., Martin JR, Mulder FA, Karimi-Nejad Y, van der Zwan J, Mariani M, Schipper D, Boelens R, Structure 1997 Apr 15;5(4):521-32. PMID: 9115441

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