Hundreds of blood groups characterized on the basis of red cell antigens have been documented.  They include clinically important groups such as Rhesus, a range of variants of A and B, and a whole suite of groups, such as Kell, Kidd, and Duffy, that were used in tissue typing before DNA became the method of choice.  None of them proved to be of sufficient value for typing stains to become much used in forensic work.

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