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Contractions to α,β-meATP are unaffected by depletion of intracellular calcium stores with CPA. Typical traces of responses in medium arteries. Control contractions evoked by emptying intracellular calcium stores with caffeine (10 mM) are abolished by prior perfusion with CPA (30 μM) while contractions to α,β-meATP (1 μM) remain unaffected.
