6FTP:
reference: Design of an allosterically modulated doxycycline and doxorubicin drug-binding protein., Schmidt K, Gardill BR, Kern A, Kirchweger P, Borsch M, Muller YA, Proc Natl Acad Sci U S A. 2018 May 14. pii: 1716666115. doi:, 10.1073/pnas.1716666115. PMID: 29760101

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