Methylmalonic Aciduria and Homocystinuria, Cblj Type, also known as methylmalonic acidemia with homocystinuria, type cblj, is related to methylmalonic aciduria and homocystinuria, cblf type and methylmalonic aciduria and homocystinuria, cbld type, and has symptoms including lethargy An important gene associated with Methylmalonic Aciduria and Homocystinuria, Cblj Type is ABCD4 (ATP Binding Cassette Subfamily D Member 4). Affiliated tissues include bone marrow and bone, and related phenotypes are decreased methylcobalamin and decreased methionine synthase activity