Mechanisms of transmembrane calcium movement in cultured chick embryo ventricular cells

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1. Uptake of calcium was studied in spontaneously contracting monolayers of cultured chick embryo ventricular cells. Ca exchange could be separated into two components: a rapid phase with a rate constant of 3·91/min, accounting for 1·6 nmol/mg protein; and a slower phase with a rate constant of 0·069/min, accounting for 2·7 nmol/mg protein.

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