1B1G:
reference: Protein solution structure calculations in solution: solvated molecular dynamics refinement of calbindin D9k., Kordel J, Pearlman DA, Chazin WJ, J Biomol NMR 1997 Oct;10(3):231-43. PMID: 9390401

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