(D) Quantification of the proportion of cycling progenitors (Sox3+EdU+/DAPI, S3+/E+/DAPI), the proportion of progenitors having divided (Sox3+EdU+/Sox3+, S3+E+/S3+) and the proportion of progenitors self-renewal (Sox3+EdU+/EdU+, S3+E+/E+) in the regenerate. The graph represents the mean +/- SD from 9 tadpoles (wt) and 8 tadpoles (foxm1-/-) with an average of 18 sections per data point. 