_:vb50948960 . _:vb50948960 "url:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3441227/"^^ . _:vb50948960 "A nutritional deficiency disease that is characterized by a decrease in red blood cells due to malabsorption of vitamin B12, has_symptom fatigue, pallor, shortness of breath, glossitis, ataxia, and/or paresthesia, has_material_basis_in atrophic gastritis, autoimmune disorder affecting the production or function of intrinsic factor, and/or genetic factors."^^ . _:vb50948960 . _:vb50948960 . _:vb50948960 . _:vb50948960 . _:vb50948960 "url:https://medlineplus.gov/ency/article/000569.htm"^^ .