label: histone H4R3 arginine deiminase activity
label_lc: histone h4r3 arginine deiminase activity
description: "Catalysis of the reaction: H2O + histone H4 L-arginyl (position 3)= histone H4 L-citrullyl (position 3) + NH4+, resulting in histone H4 citrullination at position 3."