1JDA:
reference: Crystal structures of a mutant maltotetraose-forming exo-amylase cocrystallized with maltopentaose., Yoshioka Y, Hasegawa K, Matsuura Y, Katsube Y, Kubota M, J Mol Biol 1997 Aug 29;271(4):619-28. PMID: 9281429

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