Restriction of in vitro T cell-mediated cytotoxicity in lymphocytic choriomeningitis within a syngeneic or semiallogeneic system

RECENT experiments1–3 indicate that cooperation between thymus derived lymphocytes (T cells) and antibody-forming cell precursors (B cells) is restricted by the H-2 gene complex. Helper activity in vivo operates only when T cells and B cells share at least one set of H-2 antigenic specificities. Evidence is presented here that the interaction of cytotoxic T cells with other somatic cells budding4–5 lymphocytic choriomeningitis (LCM) virus is similarly restricted.