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“Pretreatment with nifedipine (a calcium channel blocker) or extracellular Ca+2 removal by ethylenediaminetetraacetic acid ( EDTA ) greatly attenuated the relaxation effect, suggesting that calcium ion might be involved.”
“This rapid increase in [Ca2+]i was blocked by addition of EDTA (2 mM) to the external medium or by pretreatment of the cells with the calcium channel antagonist nifedipine (10 microM).”