Effects of ventral injections of braEnR or hairy2a mRNAs at tailbud stages.

The results from two to four experiments were collected. Each column displays the number of embryos with the indicated phenotype and the percentage between brackets. (1) Protuberances include small bumps that, when analysed with a sox2 probe, were found to be weak secondary axes (Fig. 7D,E), and tail-like structures, which sometimes were observed (Fig. 7F,G). (2) Sum of all the observed phenotypes: incomplete secondary axes + protuberances + spina bifida. (3) Total number of injected embryos. (4) Injections were performed in any of these four blastomeres, at random.