Cytidine deaminase: a new genetic polymorphism demonstrated in human granulocytes.

Cytidine deaminase in human white blood cells has three electrophoretic phenotypes representing the homozygous and heterozygous expression of two common alleles, CDA1 and CDA2, at an autosomal locus. To explain the multibanded pattern of the heterozygote, the enzyme is assumed to have a tetrameric structure.