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Diadenosine polyphosphates (APnA) are endogenous dinucleoside molecules consisting of two adenosine moieties linked via their 5'-ribose positions by a variable number of phosphate groups. APnA have been shown to be present in different cell types and to be released from platelets as well as co-released with catecholamines and ATP from bovine adrenal medulla. Candidate metabolites of APnA are ATP,...