Expression profiles of head and tail enriched transcripts. A) The expression profile of 1,193 head enriched transcripts during the regeneration time-course. The x-axis displays the time-course and y-axis is a standardized expression value (z-score) calculated as the number of standard deviations away from the mean expression value for the specified transcript. The blue line represents tail time-course and red line, the head time-course. Head enriched transcripts are consistently up-expressed in head fragments compared to tail fragments. B) The expression profile of 1,289 tail enriched transcripts during the regeneration time-course. Expression of tail enriched transcripts converge at 48 hours between head and tail fragments.