P 1: Antigens P, P1, P k 2: Phenotypes P1: P, P1, P k P2: P, P k P1 k : P1, P k P2 k : P k p: -----
Antigens P k & P are on different cells. Antigen P1 is only on RBC. P k Ag is the precursor of P Ag. The gene of P k is on chromosome 22. It produts Galactosil Transferase. The gene of P is on chromosome 3.
Major Phenotypes: P1,P2 Some of person who has P2 Ag nuturaly has Anti P1 Anti PBiphasic Donath LandstainerPCH (Paroxysmal Cold Hemoglobinuria)
Ag Precipient of B19 Ag P,P k recipient of shiga toxin Anti TJ a Ab against of PP1P k