1KT6:
reference: High-resolution structures of retinol-binding protein in complex with retinol: pH-induced protein structural changes in the crystal state., Calderone V, Berni R, Zanotti G, J Mol Biol 2003 Jun 13;329(4):841-50. PMID: 12787682

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