Article Abstract:
A study of the impact of partial ablations of stage 11 of the Hamburger-Hamilton scale of the eye anlage by ablating the nasal or temporal half of the retina around chick HH11 and using the eye anlage fate map at HH11 reveals that the multipotent progenitors of ganglion cells in the eye anlage have positional signals imprinted on them before stage 11. Unique clusters of ganglion cells with displaced nasal identity, which are present in the temporal retina, reveal that the cells are derived from a single cell or a few cells.
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Article Abstract:
The chick embryo epiblast layer give rise to all embryonic tissues including the skeletal muscles. Previous studies suggest that myogenesis occurs at the time of gastrulation before the entry of the primitive streak. In vitro analyses of isolated epiblast cells grown in protein-free medium showed that epiblast cells can undergo normal development even in the absence of surrounding tissues. This suggests that myogenic potential is independent under in vitro conditions and that myogenesis occurs at the primitive streak stage.
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Article Abstract:
Examination of the development of embryonic chick calvarium reveals the presence of 'chondrocyte-like' subpopulation of cells in the embryonic calvarium. Expression of chondrogenic and osteogenic phenotypes by calvarial cells are modulated by cellular interactions. Both C and D calvarial cells suppress chondrogenesis in limb mesenchymal cells, while chondrocyte-like fraction F calvarial cells increase chondrogenesis.
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