Fig. 2.

Tissue regeneration in newt results in accelerated [¹³C₆]lysine incorporation after tail amputation. The mean incorporation rate of [¹³C₆]lysine increased from 11.4% in undamaged tail tips to 46.7% in regenerating tails 40 days after amputation. The percentage of heavy-to-light peptide ratios is given on the y axis. The x axis displays the percentage incorporation rate of [¹³C₆]lysine peptide pairs. A shift in the frequency distribution was observed from 93.4% of all ratios within the mean ± S.D. interval in undamaged tail tissue after 60 days of feeding to 86.1% of all ratios within the mean ± S.D. interval in 40-day tail regenerates after 60 days of feeding.