Gene Switches

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Fruit fly embryo

Using different-colored antibody stains, we can see exactly where and to what degree Hox genes are expressed. This is a photograph of a fly embryo, once again with its anterior end to the left. It shows the expression pattern of four different Hox genes—Scr (black), Antp (red), Ubx (blue), and Abd-B (brown). As you can see, each Hox gene is expressed in a specific region along the anterior-to-posterior axis of the embryo. Now have a look at what results from such expression in the mature animal.

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