disease caused by disruption of disease has basis in disruption of disease has feature cobalamin metabolic process Vitamin B12 deficiency metabolic disease vitamin B12 deficiency A disease characterized by low serum levels of vitamin B12, either inherited or acquired. HP:0100502 ICD9:266.2 MESH:D014806 MONDO:0020696 NCIT:C131684 SCTID:190634004 UMLS:C0042847 cobalamin deficiency hypocobalaminemia vitamin b12 deficiency vitamin B deficiency