<prompt> AB blood group antigen are known as...factor -DuffyLandsteinerRhesusLutheran  <response>: The ABO blood group system is widely credited to have been discovered by the Austrian scientist Karl Landsteiner, who identified the O, A, and B blood types in 1900. Antigens were termed on his name Ref: Ananthanarayan Panikers textbook of microbiology 9th edition pg.no. : 191 