title: A further example of the low frequency antigen Pta.
abstract: The third Pt(a+) family is described and it has been shown that the red cell antigen is denatured when treated with proteolytic enzymes, but unaffected by neuraminidase and 2-aminoethylisothiouronium bromide treatment.
mesh_terms: D001789:Blood Group Antigens; D001963:Bromelains; D002918:Chymotrypsin; D004912:Erythrocytes / Q000276:immunology*; D005361:Ficain; D006801:Humans; D007519:Isoantigens / Q000235:genetics / Q000276:immunology; D008297:Male; D009439:Neuraminidase; D010206:Papain; D014357:Trypsin; D000338:beta-Aminoethyl Isothiourea
chemical_list: D001789:Blood Group Antigens; D007519:Isoantigens; D000338:beta-Aminoethyl Isothiourea; D001963:Bromelains; D009439:Neuraminidase; D002918:Chymotrypsin; D014357:Trypsin; D010206:Papain; D005361:Ficain