Figure 5

In-vivo labeling of area I in region E(0). (A) Double exposure of an in-vivo labeled embryo. The ventral ectodermal rows are marked with white lines and labeled with nomenclature. The fluorescent dye is completely diffused in the membrane of cell E(0)p1(of the left body half). (B) Same embryo as in A further developed. Ventral view of head region. The descendants of the marked cell form postero-median parts of the sternite (blurry because not in focus) and of the mandible (Md). (C) Embryo as in B further developed. Ventral view of the left mandibular segment. The mandible consists of two lobes, the inner pars molaris (Pm) and the outer pars incisivus (Pi). Few E(0)p1-clones form postero-median parts of the paragnath hump (Pg). The sternal clones seen in B are out of focus.