Yes, the P blood type is indeed real.
The P blood group system, discovered in 1927, is a recognized human blood group system. It consists of alleles designated P, P1, and Pk. These alleles are associated with specific genes: the P and P1 antigens are produced by the B3GALNT1 gene (beta-1,3-N-acetylgalactosaminyltransferase 1), while the Pk antigen is produced by the A4GALT gene (alpha 1,4-galactosyltransferase).
