By contrast , many studies have reported that mitogen activation of T cells increases cAMP levels , implying a positive physiological role for cAMP in the activation process .
by contrast , many studies have reported that mitogen activation of t cells increases camp levels , implying a positive physiological role for camp in the activation process .
O O O O O O O O B-protein_family_or_group O O B-cell_type I-cell_type O B-nucleotide O O O O O O O O B-nucleotide O O O O O