using a perfusion technique ( p.n . devreotes , p.l . derstine , and t.l . steck , 1979 , j. cell biol . 80 , 291-299 ) , it has been shown that camp secretion by aggregation-competent cells in response to an exogenous camp signal is significantly reduced by exposure to nh4cl or any of a set of carboxylic acids that includes propionate , succinate , pyruvate , and acetate .
C0007634
cell
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secretion by