Feature
![Molecular biologist John Petrini of the Sloan Kettering Institute.](https://www.sloankettering.edu/sites/default/files/styles/width_200/public/node/135607/3x2/john-petrini.jpg)
Understanding the DNA-Damage “First Responders”: John Petrini at Work
Scientists know that cancer can result from mistakes in DNA repair. But understanding what controls the repair process itself has been a hard nut to crack.
![Pictured: John H.J. Petrini, Molecular Biologist](https://www.sloankettering.edu/sites/default/files/styles/width_200/public/node/2839/image/john-petrini.jpg)
At Work: Molecular Biologist John Petrini
In identifying proteins critical to DNA repair, molecular biologist John Petrini may expand knowledge of how unrepaired DNA damage can lead to cancer.