Immunogen sequence: RVIAIDIDPV KIALARNNAE VYGIADKIEF ICGDFLLLAS FLKADVVFLS PPWGGPDYAT AETFDIRTMM SPDGFEIFRL SKKITNNIVY FLPRNADIDQ VASLAGPGGQ VEIEQNFLNN KLKTITAYFG DLIRRPASET. Catalyzes the 2 serial methylation steps for the conversion of the 7-monomethyl