3KBH:
reference: Crystal structure of NL63 respiratory coronavirus receptor-binding domain complexed with its human receptor., Wu K, Li W, Peng G, Li F, Proc Natl Acad Sci U S A. 2009 Nov 24;106(47):19970-4. Epub 2009 Nov 9. PMID: 19901337

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