1AHP:
reference: Oligosaccharide substrate binding in Escherichia coli maltodextrin phosphorylase., O'Reilly M, Watson KA, Schinzel R, Palm D, Johnson LN, Nat Struct Biol 1997 May;4(5):405-12. PMID: 9145112

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