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Fig. 2. The distribution of grafted quail mesoderm cells 1.5 to 2.5-days after
surgery (stages 19-22) is revealed by the application of anti-quail (QCPN)
antibody. (A-D) Whole embryos. Asterisks indicate ectopic somite-like
condensations; double arrowheads indicate a mesenchymal condensation adjacent
to the isthmus. DO (dorsal oblique) and LR (lateral rectus) are sites where
eye muscle primordia condense. (E,F) Sections from segmental plate grafted
hosts fixed at stage 22. These show an abundance of graft-derived cells within
and scattered around an ectopic somite-like condensation (arrow, E), and a
mesenchymal aggregate adjacent to the isthmus (Isth). (G,H) Segmental plate
hosts fixed at stages 22 (G) and 26 (H). These reveal the presence of
mesenchymal bridges (arrows) extending to the LR muscle during and after the
translocation of the LR to its definitive position. Note the presence of quail
cells circumscribing and within the trigeminal ganglion (T). Arrowheads
indicate dense cords of graft-derived cells that extend ventrally from the
isthmus region.
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