1LDR:
reference: Three-dimensional structure of the second cysteine-rich repeat from the human low-density lipoprotein receptor., Daly NL, Djordjevic JT, Kroon PA, Smith R, Biochemistry 1995 Nov 7;34(44):14474-81. PMID: 7578052

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