6DJM:
reference: Mechanism of actin polymerization revealed by cryo-EM structures of actin filaments with three different bound nucleotides., Chou SZ, Pollard TD, Proc Natl Acad Sci U S A. 2019 Feb 13. pii: 1807028115. doi:, 10.1073/pnas.1807028115. PMID: 30760599

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