since agents which affect ca2+ fluxes have been shown to affect the commitment to terminal differentiation of murine erythroleukemia cells treated with an inducer of differentiation ( bridges , k. , levenson , r. , housman , d. , and cantley , l. ( 1981 ) j. cell biol . 90 , 542-544 ) , we investigated the presence of ca2+-transport systems in plasma membranes isolated from these cells .
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