Erythrocyte diaphorases DIA1 and DIA2 in bloodstains

The ability to determine the phenotypes of erythrocyte NADH diaphorase (DIA1) was demonstrated in bloodstains, the utility of the system extending about two weeks. Electrophoretic variants representing three uncommon phenotypes (DIA1 2-1, DIA1 4-1 and DIA1 7-1) were found in five of 785 individuals tested. The NADPH diaphorase DIA2 isozymes could not be resolved sufficiently for practical use.