SET domain (including post-SET domain) found in Drosophila melanogaster suppressor of variegation 4-20 (Suv4-20) and similar proteins
Suv4-20 (also termed Su(var)4-20) is a histone-lysine N-methyltransferase that specifically trimethylates 'Lys-20' of histone H4. It acts as a dominant suppressor of position-effect variegation.