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(a) Peak areas shown for a time-series (± S.E. n = 6) of 23Na TQF and DQF spectra acquired in an interleaved fashion in the perfused mouse heart during stability and during subsequent infusion of 50 μM ouabain, shaded area. Representative TQF and DQF spectra are shown; (b) during stability, (c) after 20 min infusion of ouabain, (d) after 20 min K+-free buffer and (e) after 20 min K+-free/Ca2 +-free buffer.
