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Hemodynamic responses to changes in superfusate ATP in rat gluteus maximus muscle. Change in diameter [A, n = 6 or 7; B, n = 10 or 11 (10−8 ATP; n = 7)] and blood flow [C, n = 3–4; D, n = 5 or 6] of second-order and third-order branches of the arteriolar network in rat gluteus maximus muscle with cumulative addition of ATP to the superfusate. *P < 0.05, **P < 0.001, significant change from baseline. #P < 0.05 significantly different from previous ATP concentration.
