4DRS:
reference: Crystal structure of Cryptosporidium parvum pyruvate kinase., Cook WJ, Senkovich O, Aleem K, Chattopadhyay D, PLoS One. 2012;7(10):e46875. doi: 10.1371/journal.pone.0046875. Epub 2012 Oct 9. PMID: 23056503

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