Assertion: endogenous adenosine | /r/HasProperty | responsible for unique vascular response
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text: Because adenosine tissue content increases within 30 s of ischemia threefold and because theophylline, in doses which can antagonize exogenously applied adenosine, also blocked the postocclusive vasoconstriction, we concluded that endogenous adenosine was responsible for this unique vascular response (253).