macrophages 's activity was studied the days 7 , 14 , 21 , 28 , 35 , and 42 after inoculation , by the following assays : phagocytosis in vitro , mononucleated phagocytic system by the colloidal carbon clearance technique , the lymphocyte 's activity by the direct plaque forming cells technique ( pfc ) and delayed hypersensitivity ( dth ) .
C0031308
phagocytosis
C0007634
the