Direct tumor recognition by a human CD4+ T-cell subset potently mediates tumor growth inhibition and
(A) SK37 was co-cultured with or without TR-CD4 or NTR-CD4 for 5 days. Non-adherent T cells were removed by repeated rinses using culture medium and adherent SK37 were further cultured for 10 days. Cell numbers were determined by trypan blue exclusion ......