vitamin B12-responsive methylmalonic acidemia vitamin B12-responsive methylmalonic acidemia, type cblDv2 MONDO:0017685 UMLS:C1848554 GARD:0017391 MEDGEN:376388 Orphanet:308442 vitamin B12-responsive methylmalonic aciduria, type cblDv2 methylmalonic aciduria and/or homocystinuria, cblD type