Reaction catalyzed by 2,3-bis-O-geranylgeranyl-sn-glycero-phospholipid reductase (1.3.7.11)

		+		reduced dithionite	=			+		oxidized dithionite
	geranylgeranyl diphosphate	+		reduced dithionite	=		hexahydro-geranylgeranyl diphoshate	+		oxidized dithionite