Six-year-old Molly Nash, who has Fanconi anemia, poses with her family, four-week-old brother Adam Nash, and parents Jack and Linda Nash, at Camp Snoopy at the Mall of America in Bloomington, Minn., Sept. 18, 2000. Adam is believed to be the first time genetic testing has been used by parents to have a child who not only is free of a disease, but also is the best tissue match for a sibling who needs a transplant. (AP Photo/Star Tribune, Richard Sennott)