2KR5:
reference: Solution structure of an acyl carrier protein domain from a fungal type I polyketide synthase., Wattana-amorn P, Williams C, Ploskon E, Cox RJ, Simpson TJ, Crosby J, Crump MP, Biochemistry. 2010 Mar 16;49(10):2186-93. PMID: 20136099

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