normal effector cells ( nec ) cytotoxic for normal dermal-derived fibroblasts in vitro were present in rats 3-36 weeks old , were tissue-dependent ( with low levels in lymph nodes and thymus , unrelated to cellular suppression ) , were nylon wool and glass non-adherent and sensitive to 400 rad of x-irradiation in vitro .
C0016030
fibroblasts
C0007634
cellular