PRDM2 and neoplasm: Specifically, tumor suppressor function requires the establishment of the H4K20me1-H3K9me1 trans-tail ‘histone code’ at specific loci through the direct interaction of RIZ1 PR-binding motif to PR-Set7 monomethyltransferase, an essential component of the mammalian cell cycle, which is needed for proper DNA replication and mitosis, thus hypothesizing an additional mechanism of action [84].