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T cell suppression of contact sensitivity in the mouse. III. The role of macrophages and the specific triggering of nonspecific suppression

Passive transfer of contact sensitivity and suppression of contact sensitivity by lymph node cells is abolished by treatment with anti‐Θ serum and complement. In contrast, both these forms of passive transfer by peritoneal exudate cells resist treatment with anti‐Θ serum but are abolished by trypsin. This suggests that the cell responsible in the peritoneal exudate is a macrophage or other Θ‐negative cell.