the former is thought to be released from the endoplasmic reticulum in response to inositol trisphosphate , while the latter enters the cells through a membrane potential-sensitive transporter ( oettgen , h. c. , terhorst , c. , cantley , l. c. , and rosoff , p. m. ( 1985 ) cell 40 , 583-590 ) .
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the cells
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cell