has material basis in germline mutation in TCN2 immune system disorder transcobalamin II deficiency https://github.com/monarch-initiative/mondo/issues/6747 https://www.malacards.org/card/transcobalamin_ii_deficiency ICD10CM:D51.2 TC 2 deficiency GARD:0012338 TCN2 deficiency inherited deficiency of transcobalamin UMLS:C0342701 Tcn2 deficiency SCTID:237934001 Transcobalamin deficiency (TC) is a disorder of cobalamin transport that usually presents during the first few months of life and is characterized by megaloblastic anemia, failure to thrive, vomiting, weakness and pancytopenia. MEDGEN:137976 OMIM:275350 transcobalamin II deficiency transcobalamin deficiency MONDO:0010149 DOID:0050818 Orphanet:859 transcobalamin 2 deficiency NCIT:C142806 hereditary anemia inborn disorder of cobalamin metabolism and transport