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“The vasoconstrictor responses to adenosine , ATP, guanosine and GTP were effectively antagonized by either methysergide or reserpine , whereas those to uridine and UTP were not modified by either methysergide or phentolamine.”
Japanese journal of pharmacology • 1979 | View Paper
“ATP, ADP and adenosine produced concentration-dependent inhibition of peristaltic activity in non-treated, reserpine- or 6-hydroxydopamine-pretreated preparations; the relative potencies in descending order were ATP ⩾ ADP > adenosine.”