5UBX:
reference: Modulation of protein A binding allows single-step purification of mouse bispecific antibodies that retain FcRn binding., Zwolak A, Armstrong AA, Tam SH, Pardinas JR, Goulet DR, Zheng S, Brosnan K, Emmell E, Luo J, Gilliland GL, Chiu ML, MAbs. 2017 Sep 12:0. doi: 10.1080/19420862.2017.1375639. PMID: 28898162

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