importantly , the macrophages or u937 cells had to be cultured with con a-stimulated lymphocyte culture supernatant or ifn-gamma prior to fixation with paraformaldehyde , suggesting that a molecule ( s ) inducible on accessory cells surface by ifn-gamma or other lymphokine is necessary for the effective accessory cell-t cell interaction to induce the t cell response .
C0024264
lymphocyte
C0024297
lymphokine