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An unusual variant of blood group A
1Criminalistics Laboratory, Philadelphia Police Department, PA.
Abstract:
A blood specimen from a forensic science case appeared to violate Landsteiner's Rule. The red cells failed to react with anti-A, anti-B, or O serum while reacting strongly with Ulex europaeus lectin but not other anti-A lectins. The saliva from the person involved was found to contain both A and H blood group substances in a ratio of 4:1. The blood group was determined to be type Am.
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