4AKR:
reference: Conservation and divergence between cytoplasmic and muscle-specific actin capping proteins: insights from the crystal structure of cytoplasmic Cap32/34 from Dictyostelium discoideum., Eckert C, Goretzki A, Faberova M, Kollmar M, BMC Struct Biol. 2012 Jun 1;12(1):12. PMID: 22657106

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