Oooc oc

Figure 5. Domain structure of an acidic activation protein. This protein enhances the ability of general transcription factors to bind to the promoter.

Acidic activation domain

Gene regulatory « protein

Oh

DNA binding domain

Regulatory element

Promoter

Gene

genes specify large regions of an animal's body plan. Mutations in these genes can transform one body part into another. For instance, a mutation in the antennapedia gene of fruit flies will convert antennae to legs. Thus, expression of a single gene can trigger the expression of a whole battery of genes.

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