Reaction catalyzed by [histone H3]-lysine4 N-dimethyltransferase (2.1.1.370)

2		+			=	2		+
	2 S-adenosyl-L-methionine	+		a [histone H3]-L-lysine4	=		2 S-adenosyl-L-homocysteine	+		a [histone H3]-N6,N6-dimethyl-L-lysine4