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Embryonic cells "know" where they are relative to each other by chemical signals, same as in adults. These molecules are known as morphogens (specific examples include the sonic hedgehog and β-catenin). The amount of morphogen in a region of cells determines which gene gets turned on and thus what it develops into. And the amount varies by how far they are ...


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Not all cat predatory behavior is innate. Researchers found that cats predatory behavior for birds vs. mice depends to a significant degree on training by the mother: if the mother taught predatory behavior with birds, the kittens grew up to be better at catching birds than at catching mice and vice versa. Supportive data shows that aside from monkeys and ...


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I wanted to add some helpful references. The 6th edition of the Gilbert Developmental Biology textbook is available on NCBI bookshelf. It's a bit old (2000), but much of the information is still relevant. You can search this textbook for specific terms but not browse. There is also a collaborative science/fashion project between the Storey sisters, called ...


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yea the hox genes are essential for the the specification of the location but the actual growing of the limbs are determined by a series of protein and other factors. proximal limb contains fgf(fibroblast growth factors) wnt(look up wnt pathway) and high levels of retonic acid where distal limbs shows high fgf's high wnt and little to none RA. the sonic the ...



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