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Simultaneous measurements of pHi and cell shortening in the absence and presence of external HCO3− A, average pHi values obtained in five myocytes during the switch of the extracellular solution from Hepes to HCO3−. B, average cell shortening (n = 5, expressed as percentage change with respect to the value in Hepes measured immediately before the switch to HCO3−) recorded simultaneously with pHi.
