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Amplitude of P0 (Sr) relative to P0 (Ca). The dashed line indicated P0 (Ca) of each muscle taken as 100%. Amplitudes of tension elicited by Sr2+ ions were expressed relative to P0 (Ca) in the absence (black bars) and presence (white bars) of 100 μM BPD. *Indicated significant difference between Sr and Sr+BPD activations.
