4X23:
reference: A conserved mechanism for centromeric nucleosome recognition by centromere protein CENP-C., Kato H, Jiang J, Zhou BR, Rozendaal M, Feng H, Ghirlando R, Xiao TS, Straight AF, Bai Y, Science. 2013 May 31;340(6136):1110-3. doi: 10.1126/science.1235532. PMID: 23723239

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