grain of sand in the size of empire state building. brac 1 and brac 2. can you explain what those are? >> we have have them. everyone has brac genes. when you have a faulty version. let's say the gene is a word. the faulty version is the word with a misspelling. so instead of dg it's dop or whatever. that misspelling will cause the gene to go awry and cause a process where breast cancer will be more common. different people have different m misspellings. you don't want a misspelling. the gene looks for misspelling and which misspelling it is. >> when she tested positive for the breast cancer gene mutation, she actually had this test done by a company more than likely called myriad genetics. it's the only company.