5WP4:
reference: Conformational changes in the di-domain structure of Arabidopsis phosphoethanolamine methyltransferase leads to active site formation., Lee SG, Jez JM, J Biol Chem. 2017 Oct 30. pii: jbc.RA117.000106. doi: 10.1074/jbc.RA117.000106. PMID: 29084845

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