beta-dihydromenaquinone-9 + A => menaquinone-9 + AH2
beta-dihydromenaquinone-9 + a => menaquinone-9 + ah2
beta-dihydromenaquinone-9 + A => menaquinone-9 + AH2
beta-dihydromenaquinone-9 + a => menaquinone-9 + ah2