LIBROS DEL AUTOR: c g van oostrom

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  • Cephalic Neural Crest and Placodes
    C.D.A. Verwoerd / C.G. van Oostrom
    In 3-4 week human embryos, the ectoderm covering the head shows considerable re­ gional differences in both structure and thickness. The temporary appearance of circumscribed areas of relatively thick ectoderm has been observed in embryos of a variety of vertebrates. These areas, discovered by Van Wijhe (1882) in fish embryos, were called placodes by ...
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