Summary of the effects of GliA and Shh electroporations A. Control. B. GliA electroporated. C. Shh electroporated (non-ventralized). D. Shh electroporated (partially ventralized). Values of Mean ± standard deviation of inter-mitotic interval length (I-MI), mitotic NEcs density (Dens) and fractal dimension (fd), are indicated for optic tectum (blue), ventral midbrain (green) and ventralized dorsal midbrain (light blue). These values correspond to global means calculated over the entire D-V axis of each region. See descriptions in the text.