1CX6:
reference: Substitution with selenomethionine can enhance the stability of methionine-rich proteins., Gassner NC, Baase WA, Hausrath AC, Matthews BW, J Mol Biol 1999 Nov 19;294(1):17-20. PMID: 10556025

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