Average apparent kpl and kpa rate constants with corresponding standard deviations in liver, kidney and vasculature ROIs from 5 animals. Conversion of labeled pyruvate to lactate increased in the liver after ethanol administration as seen by the increase in kpl. There was no significant change in kpl for kidney or vasculature, or in kpa in any of the tissues. Though the inter-subject variability leads to relatively high standard deviations, the intra-subject comparison between pre-and post-ethanol in Fig. 5 clearly shows the change in rate constants.