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Fig. 2. Distribution in stage 13 blastoderm of cell populations that later gave
rise to neural or non-neural tissues. (A) A single labeled precursor cell
(arrow) at stage 13 embryo in animal pole view. The arrowhead indicates
embryonic shield. (B) Anterior region of the same embryo at stage 24 (44 hpf)
in lateral view. The single cell shown in A divided, and its daughter cells
(arrows) were later fated to mesencephalon (m) and rhombencephalon (rhombomere
1) (r). (C) One hundred and seven randomly chosen cells of stage 13 (13 hpf)
embryos, one to two cell diameters beneath the envelope layer, were labeled
and their location in stage 24 embryos (44 hpf) was recorded. Labeled neural
progenitor cells (including CNS, placodes and neural crest) are indicated by
red dots and shown in animal pole view. Light blue dots represent cells that
contributed to epidermis and purple dots to somitic mesoderm. The arrowhead
indicates dorsal midline (embryonic shield). Blastoderm margin (leading edge
of epiboly) is indicated by a circle. The dot with an arrow indicates the
labeled cell shown in A. Broken lines highlight the 140° neurogenic
sector. Scale bars: 200 µm.
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