we previously reported that phi in hf cells is rapidly raised by growth factors due to activation of a na+/h+ exchange mechanism in the plasma membrane ( moolenaar , w. h. , tsien , r. y. , van der saag , p. t. , and de laat , s. w. ( 1983 ) nature ( lond . ) 304 , 645-648 ) .
C0007634
cells
C0007603
plasma membrane