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Models of the physiological and pathobiological effects of adenosine 5’-triphosphate in the retinal microvasculature. A: Putative mechanisms regulating purinergic vasotoxicity; B: Putative mechanisms by which extracellular adenosine 5’-triphosphate (ATP) causes pericyte Ca2+ levels to rise and thereby the contraction of these mural cells and the constriction of adjacent lumens. From Sugiyama et al[33].
