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Additivity of ATP/ADP and UTP/ADP actions but not of ATP/UTP actions. Comparison of relative potencies of 10 μM ADP, 100 μM ATP and 100 μM UTP and their mixtures for increasing [Ca2+]i are shown. Cells were treated with nucleotides in the standard buffer with 2 mM CaCl. Means±s.d. from four experiments are shown (number of cells tested: n=32).
