Distribution of mitotic cells during neocortical development.

<p>Numbers represent the proportion of mitotic cells in each compartment of the developing somatosensory cortex in each species. Cells were counted in a minimum of seven coronal sections from each age in each species. Mitoses were identified by 4A4 immunoreactivity, or condensed chromatin using DAPI or Nissl staining. Numbers in parentheses indicate the total number of mitotic cells counted in each compartment for each age in each species.