1CQ2:
reference: Enhanced visibility of hydrogen atoms by neutron crystallography on fully deuterated myoglobin., Shu F, Ramakrishnan V, Schoenborn BP, Proc Natl Acad Sci U S A 2000 Apr 11;97(8):3872-7. PMID: 10725379

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