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Fig. 4. Time course of 31P NMR spectra of elephant seal muscle acquired
in vivo during an apneic episode. The 31P spectra were
recorded continuously, each scan requiring 70 s of signal averaging. The
spectra correspond to (a,b) eupneic state, (c–f) apneic state and (g,h)
eupneic state. The 31P signals exhibit no change during the eupnea
to apnea transition. Peak 1 denotes Pi; peak 2, PCr; and peaks 3, 4
and 5, the 
, 
and β signals of ATP, respectively.
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