these structures consist chiefly of a. crossreactive ( cr ) antigens , i.e . common or similar epitopes in both bacteriae and mammalian tissues , and b. polyclonal cell activators , e.g . the polyclonal b-cell activator ( pba ) which induce immunologically many nonspecific resting b-cell clones to mature into ig secreting cells .
C0003320
antigens
C0003316
epitopes