Fig. 3. Quail/chick chimaera fate map of deep mesenchymal tissue extending 100-150 µm posterior to the median pit. (A) Schematic diagram illustrating the localisation of transplanted quail tissue into the six-somite chick embryo. (B) Cross-sections at the level of rostral PSM and (C) epithelial somite, of chimaeras incubated for 24 hours, showing the localisation of the quail donor cells in the medial part of these tissues. Note that a cross section in the more rostral PSM evidences the Wolffian duct. Scale bar: 70 µm