(electronic tone beeping) my name is kondwani phiri. i'm a genetic researcher. you could say, it's in my blood. from an early age of about eight or nine or so, i had just a natural curiosity for the natural world. cancer runs in my family. in fact, i lost my aunt to breast cancer. and that peaked my interests in genetics. i'm fascinated by how the genes we inherit shape our biological destiny, including our health. i believe the key to treatments and cures for diseases like these, lies in explicit efforts to engineer human genes. but can we fix not only what's broken but also enhance our genetic codes and improve on mother nature? the unique sequence of these base pairs are instructions for the body to make proteins. the base pairs are like musical notes on a score that tell a musician how to play a song. when all the different sections of the dna are played, the result is a biological symphony. (upbeat orchestral music) but like the musical note played out of key that compromises the entire performance, there is an error in one of annabel's genes. (annabel groa