poly ( a+ ) rna isolated from frtl-5 cells ( a continuous line of cultured and fully functional rat thyroid cells ( ambesi-impiombato , f. s. , parks , l. a. m. , and coons , h. g. ( 1980 ) proc . natl . acad . sci . u. s. a . 77 , 3455-3459 ] was injected into xenopus laevis oocytes , and the expression of the na+/i- symporter in the plasma membrane was assayed by measuring the na+-dependent clo4 -- sensitive uptake of 125i .
C0007634
cells
C0007603
plasma membrane