Structures of<unk>  blood<unk>  antigens<unk>  (formerly: P) is a human blood<unk>  system (International Society of Blood Transfusion system 003) based upon the A4GALT gene on chromosome 22. The P antigen (later renamed P1) was first described by Karl Landsteiner and Philip Levine in 1927. The<unk>  consists of three glycosphingolipid antigens: Pk, P1 and NOR. In addition to glycosphingolipids, terminal Galα1→4Galβ structures are present on complex-type N-glycans. The GLOB antigen (formerly P) is now the member of the separate GLOB blood<unk>  system.
P1PK blood group system
Junior blood group system
Augustine blood group system
Vel blood group
Indian blood group system
Triple response of Lewis
Hh blood group
Rh blood group system