5FSM:
reference: MTH1 Substrate Recognition--An Example of Specific Promiscuity., Nissink JW, Bista M, Breed J, Carter N, Embrey K, Read J, Winter-Holt JJ, PLoS One. 2016 Mar 21;11(3):e0151154. doi: 10.1371/journal.pone.0151154., eCollection 2016. PMID: 26999531

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