Figure 4. Proneural genes promote neural development.
(A) Lateral view of embryo prior to NB delamination. Expression pattern of the proneural genes ac, sc and l’sc in proneural clusters corresponding to S1 NBs. (B) Map of S1-S3 NBs of two hemisegments (T2, T3) in wild type embryo (left) and embryo deficient for the AS-C (right) (from65). (C) Photographs of ventral nerve cord labeled with anti- HRP in wild type (left), loss of AS-C (center), loss of AS-C and da (right). (D, E) Role of proneural gene products of AS-C and interacting factors (Da and Emc).