1Z5N:
reference: Structural snapshots of MTA/AdoHcy nucleosidase along the reaction coordinate provide insights into enzyme and nucleoside flexibility during catalysis., Lee JE, Smith GD, Horvatin C, Huang DJ, Cornell KA, Riscoe MK, Howell PL, J Mol Biol 2005 Sep 23;352(3):559-74. PMID: 16109423

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