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The gene called BRCA1 actually contains instructions for four different proteins, IFP35, BRCA1, RHO7 and IFB35. These instructions are called exons. If you place your mouse on the image you can see these exons at the very top in the sorted version. The next region down with a regular pattern consists of noncoding DNA called ALU repeats. These make up 35% of the BRCA1 gene. These are the regions in the middle. The smeared appearance is due to deletion and point mutations that have occurred over the entire history of this gene.