4BUP:
reference: A novel route to product specificity in the Suv4-20 family of histone H4K20 methyltransferases., Southall SM, Cronin NB, Wilson JR, Nucleic Acids Res. 2013 Sep 18. PMID: 24049080

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