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			in vitrousing the procedure stated in this
		(2) Either the cyclopamine had no effect on whisker formation or , more likely, the embryos were actually later in development than 13.5 dpc. After staging the mice, we realized that the mice were probably 15 dpc on the day they were removed from the mother. The hands had distinct fingers which corresponded with at least 14 dpc mice. In addition, the progression of development of the eye corresponded to at least 15 dpc mice.