similarities in the molecular masses , charges , as well as the presence of highly conserved crossreactive epitopes , failure to bind to carboxymethylcellulose at ph 4.2 , and extractability of the 17/19 kd proteins by 400 mm nh4cl-ethanol at 0 degrees c indicated that these antigens were analogous to the proteins p0 ( 38 kd ) and p1/p2 ( 17/19 kd ) described previously ( 25 , 36 ) .
C0003316
epitopes
C0003320
antigens