the defect in [ ( 57 ) co ] -cobalamin binding exhibited by both cbl c and cbl d fibroblasts is almost certainly not a result of mutations which affect the methyltransferase or mutase apoenzymes , since the electrophoretic mobilities and the affinities of these enzymes for their respective cobalamin coenzymes are indistinguishable from those in control cell extracts .
C0016030
fibroblasts
C0007634
cell