Parietal cells generate stomach acid as well as a substance called intrinsic factor, which enables a vitamin called B12 to be absorbed further along in the gut.

壁细胞产生胃酸，以及一种叫做内在因子的物质，使得维生素B12能够在肠道里得到吸收。

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This stops intrinsic factor from attaching to B12, and so the vitamin cannot be absorbed into your body.

这个站的内在因素，从重视B12的，所以维生素不能吸收到您的身体。

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Sometimes, your GP may want to check your blood for intrinsic factor antibody levels.

有时候，你的家庭医生可能要检查你的血液内在因素的抗体水平。

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Vitamin B-12 deficiency anemia caused by a lack of intrinsic factor is called pernicious anemia.

CNN: Vitamin deficiency anemia

Without intrinsic factor, vitamin B-12 can't be absorbed and leaves your body as waste.

CNN: Vitamin deficiency anemia

However, a vitamin B-12 deficiency is most often due to a lack of a substance called intrinsic factor.

CNN: Vitamin deficiency anemia