Gray was diagnosed with sickle cell disease when she was an infant. She was considering a bone marrow transplant when she heard about the CRISPR study and jumped at the chance to volunteer.
CRISPR and other gene technology is exciting, but shouldn't be seen as a panacea for treating illness linked to genetic mutations, says science columnist and author Carl Zimmer. It's still early days for the clinical applications of research.
Tymia McCullough is a poised, pageant-winning 11-year-old from South Carolina. She also happens to have sickle cell anemia and relies on Medicaid to pay for medical care.
Liam James Doyle/NPR
Nurse Corean McClinton, left, talks about pain management with Sherry Webb at the Sickle Cell Disease Center in the Truman Medical Center, in Kansas City, Mo., in 2007.
Dick Whipple/Associated Press