Skin and feather
نویسندگان
چکیده
منابع مشابه
Feather pattern stability and reorganization in cultured skin.
1. The formation of the feather pattern has been studied in skin explants obtained from the lumbar region of the spinal pteryla of 6\to 7^-day chick embryos. Explants were cultured in vivo on the chorioallantoic membrane (CAM) or in vitro, either on semi-solid natural media (containing whole chick embryo extract (J£) or chick brain extract (EC)), or in a liquid synthetic medium (199). 2. Feathe...
متن کاملAnchor Filament Bundles in Embryonic Feather Germs and Skin
Dur ing development of embryonic chick skin, fiber-like processes extend from the region of the epidermal-dermal interface deep into the dermis (1). As judged by phase contrast microscopy, the processes originate from epidermal basal cells tha t p ro t rude downward into the dermis. Al though occurring in younger skin, the extensions are most p rominen t at the t ime of feather placode formatio...
متن کاملAdhesion molecules in skin development: morphogenesis of feather and hair.
Figure 9 summarizes the morphogenetic process of feather and hair. Hair of feathers are formed from a layer of homogeneously distributed mesenchymal cells. The mesenchymal cells start to condense to form foci in response to some unidentified induction signal (Fig. 9B). Several adhesion molecules, including L-CAM, N-CAM, integrin, tenascin, as well as proteoglycan, are involved. These adhesion m...
متن کاملExogenous glycosaminoglycans (GAG) are able to modulate avian skin differentiation (epithelial keratinization and feather formation).
Several reports have suggested that mesenchymal glycosaminoglycans (GAG) may be involved in the regulatory role of epithelial differentiation. Some researchers have pointed out that exogenous GAG affects extracellular GAG accumulation. We have therefore examined the effect of added GAG on two typical processes of avian skin differentiation: keratinization and feather formation. Glycosaminoglyca...
متن کاملFeather formations
The individual feathers in the skin of a developing chicken embryo are arranged in a precise array within a series of so-called 'tracts'. The images above show nascent feather buds in the legs of embryos at 8–9 days of incubation. Buds are added sequentially across the forming feather tract, as shown by the range of developmental stages in the image at top left. (In all three upper images, buds...
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ژورنال
عنوان ژورنال: Nature
سال: 1974
ISSN: 0028-0836,1476-4687
DOI: 10.1038/248620a0