Uncommon P blood group was recognized by Landsteiner and Levine after they intentionally inoculated rabbits with human crimson cells in an effort to discover new blood group components. For the reason that ensuing discovery of anti-P1, plenty of associated antibodies have been recognized, together with anti-P, -Pk, -Tja, and -Luke (LKE). The uncommon phenotype for this technique is named p [formerly Tj(a-)]. Quickly after the invention of this phenotype it was famous that the naturally occurring antibodies in p females have been a explanation for early abortion. Curiously, the p phenotype is discovered extra regularly within the Amish inhabitants.