单词	cobalamin
释义	cobalamin /kə(ʊ)ˈbaləmɪn / noun Biochemistry Any of a group of cobalt-containing substances including cyanocobalamin (vitamin B12).The enzyme catalyzes the first common step in the biosynthesis of the tetrapyrrole pigments such as chlorophyll and cobalamin.... Vitamin B12 is actually a family of compounds called cobalamins, each of which has its own potential biological activity, in terms of absorption and potency. It is unknown whether lowering plasma homocysteine levels with folic acid and cobalamin improves coronary endothelial function in patients. Origin 1950s: blend of cobalt and vitamin.
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