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Comparison of fingernail ridge patterns of monozygotic twins.

The ridge patterns on the fingernails of corresponding fingers of a pair of twins were compared microscopically and found to be readily distinguishable from one another. Based on blood grouping in six blood group systems (ABO, Rhesus, Ss, Duffy, Kidd, and Kell), the probability that the twins were monozygotic was calculated to be 89.1%.