Mosaic and Regulation Phenomena during the Early Formation of the Chick Blastoderm
(a): Stereomicroscopic ventral view (alive) of the isolated right half of an unincubated chicken blastoderm after 1 day of culture; the hemi-embryo is localized close to the free cut edge (now bent). Two parts of the embryo are visible, the broad head region (upper arrow) and the trunk region with a narrow hemi-PS (indicated by lower arrow). Confirmed after sectioning and staining. (plane of sections, indicated by two parallel bars) Bar = 1 mm. (b): Stereomicroscopic ventral view (alive) of the isolated left half of an unincubated chicken blastoderm after 1 day of culture. It forms a mirror image with the right half embryo of Figure 2(a) with the same indications. Bar = 2 mm.
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