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ATP-induced O2− accumulation is significantly reduced by antagonists of P2 receptors, adenosine, and antagonists of Ca2+ signaling. Leaves were assayed for O2− 1 h after treatment. The error bars represent sd. For treatment with inhibitor plus ATP compared to ATP alone, P is <0.0001; n ≥ 8. The dashed line marks the level of O2− accumulation in the buffer control.
