Fig. 8. Asymmetric P/P division for preparation of efficient neuron release. (A) Schematic illustration showing division patterns that we observed in the pre-cortical plate (CP) stage. SP, subplate. (B,C) Morphological changes observed in S-dividing (B) and NS-dividing (C) cells during the progression of their cell cycle. In the upper panels, mitotic daughter cells that inherited the basal process (^BPP_S-div and ^BPP_NS-div) are shown; the lower panels depict non-inheritors (P_S-div and P_NS-div). (D) Ngn2 expression is lineage restricted and varies with the cell cycle.