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A cobalt-containing coordination compound produced by intestinal micro-organisms and found also in soil and water. Higher plants do not concentrate vitamin B 12 from the soil and so are a poor source of the substance as compared with animal tissues. INTRINSIC FACTOR is important for the assimilation of vitamin B 12.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D014805 · MeSH 2026。
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