An inherited metabolic disease affecting cobalamin (vitamin B12) intestinal absorption, transport in the blood, uptake by peripheral cells or cellular metabolism.
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hereditary hypercarotenemia and vitamin A deficiency
MONDO:0007272
transcobalamin I deficiency
MONDO:0008659
hereditary intrinsic factor deficiency
MONDO:0009852
Imerslund-Grasbeck syndrome
MONDO:0009853
transcobalamin II deficiency
MONDO:0010149
familial isolated deficiency of vitamin E
MONDO:0010188