mutation in the bracket 2 gene in iceland. it is carried by .8% of the population. women who carry this mutation has 8 6 probable developing cancer. we can at the push of a button find all these carriers or find enscripted i.d. of all these carriers. so if society would want to use this, they could find these women, approach them, and medicate most of them. >> understanding who they are, it's a huge part of icelandic culture and it has a history. rooted in viking times, going back more than 1,000 years. whoa, this thing is crazy.