The picture below shows a DNA binding protein found in Drosophila called the "Engrailed Homeodomain Protein." It plays an important regulatory role in determining cell fate during organismal development. The structure reveals how this protein interacts with a unique sequence in the DNA, to regulate a set of genes.

For a more global view of the structure, click here. For another specific view, click here.

But to really understand the structure, you need to play with it yourself. If you have the CHIME plug-in installed into your recent-vintage browser (Netscape 3.01 or greater), then click here and have fun!