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Pyridoxal phosphate-6-azo(benzene-2,4-disulfonic acid) tetrasodium salt hydrate (100 [micro]M), a selective P2 purinoceptor antagonist, markedly attenuated the responses to schisandrin.
Pre-treatment with 100 pM of PPADS, a selective P2 purinoceptor antagonist, abolished the response of ATP (2 p.
P2 purinoceptor antagonists inhibit the non-adrenergic, non-cholinergic relaxation of the human colon in vitro.