Fig. 5From: Holotranscobalamin (HoloTC, Active-B12) and Herbert’s model for the development of vitamin B12 deficiency: a review and alternative hypothesisAlternative model for the development of vitamin B12 deficiency. Total B12, serum total vitamin B12 concentration; HoloTC, serum holotranscobalamin concentration; MMA, plasma methylmalonic acid concentration; tHcy, plasma total homocysteine concentrationBack to article page