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Phrenic motoneuron somal volume was different across groups. (a) Distribution of phrenic motoneuron somal volumes in control, SH and TTX animals. (b) Distribution of Z-scores for the somal volumes in control, SH and TTX animals. Note the leftward shift in volume distribution with SH, indicating a decrease in the volume of larger phrenic motoneurons. In contrast, with TTX, the distribution is shifted to the right.
