1AVE:
reference: Crystal structure of apo-avidin from hen egg-white., Pugliese L, Malcovati M, Coda A, Bolognesi M, J Mol Biol 1994 Jan 7;235(1):42-6. PMID: 8289264

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