.In the world of DNA testing, it's ideal to have a relatively small gene that can contain a limited number of mutations associated with a single disease. In other words, the...

.In the world of DNA testing, it's ideal to have a relatively small gene that can contain a limited number of mutations associated with a single disease. In other words, the smaller the area to be analyzed and the fewer mutations to be identified, the easier the testing process. Unfortunately, the two genes known to predispose to breast and ovarian cancer—BRCA 1 and BRCA2 — meet neither of these criteria.Here are a few of the top labs.