Specific recognition of NY-BR-1 transfected COS-7 cells by T cell clones NW1100-CTL-7 and NW1100-CTL-43. Only HLA-A2 and NY-BR-1 transfected COS-7 cells were recognized by the two T cell clones, but not HLA-A2 negative or NY-BR-1 negative COS-7 cells. Results were confirmed by duplicate assays.