Reaction catalyzed by thioredoxin-independent methionine sulfoxide reductases B (1.8.4.B3), peptide-methionine (R)-S-oxide reductase (1.8.4.12)

		+			=			+
	L-methionine (R)-sulfoxide	+		dithiothreitol	=		L-methionine	+		dithiothreitol disulfide