Tumor APCs-MB are TSA (Id) primed and stimulate TSA (Id)-specific T cells.

Large (1.5-3 g) Id⁺ tumors (MOPC315) and Id⁻tumors (J558) were established in BALB/c mice. APCs-MB were isolated from tumors or spleens and tested for their ability to induce proliferation of the indicated types of responder T cells. APC-MB (stimulators): ■, J558; ▪, MOPC315; , spleen (MOPC315–tumor-bearing mice).