The onset of differentiation in the epiblast of the chick blastoderm (SEM and TEM)
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- Bancroft, M. & Bellairs, R. Cell Tissue Res. (1974) 155: 399. doi:10.1007/BF00222814
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Chick embryos have been examined by scanning and transmission electron microscopy from the unincubated to the late head process stages (Hamburger and Hamilton stages 1–5). Regional variations in cell structure have been found to develop very shortly after incubation begins and these become more clear cut with further development. In particular, those cells which are destined to invaginate possess fewer microvilli but more globular projections and more vesicles, than the cells which are destined to form the ectodermal covering of the embryo.