It well documented and if you take a look at Issitt's Blue Bible "Applied Blood Group Serology" you see numerous citations where certain serums contain loads of antibodies to low freqs--the Blo serum contained antibodies to Bpa, Gf, Jna, Moa, Or, Pta, Ria, Swa, Tra, Vga, Vw, Wra, BOW ans Skjelbred--a real hodge podge of goodies