evidence is presented that virion-derived antigens as well as viral antigens expressed on cell surfaces after infection , may participate in the formation of `` '' target-antigen complexes '' '' ( tacs ) which render vaccinia virus-infected cells susceptible to recognition and killing by syngeneic , vaccinia virus-specific cytotoxic t cells ( vv-ctls ) .
C0003342
viral antigens
C0003320
-antige