Vitamin B12 Deficiency, also known as cobalamin deficiency, is related to imerslund-grasbeck syndrome 1 and atrophic gastritis. An important gene associated with Vitamin B12 Deficiency is AMN (Amnion Associated Transmembrane Protein), and among its related pathways/superpathways are Infectious disease and Metabolism. The drugs Vitamin A and Micronutrients have been mentioned in the context of this disorder. Affiliated tissues include breast and bone, and related phenotypes are Increased shRNA abundance and homeostasis/metabolism