"The assumption that we each have a single genome turns out to be off by a trillion-fold," said Geoffrey von Maltzahn, Ph.D., Co-Founder and Chief Executive Officer of Quotient Therapeutics and General Partner, Flagship Pioneering. "All cells accumulate random genetic changes in their DNA, resulting in trillions of unique genomes in the body. Some genetic changes make a cell resistant or vulnerable to disease, while others can cause disease. We started Quotient to study the natural genetics library inside every tissue, discover gene variants that are beneficial, neutral, or disease-causing, and to harness that knowledge to develop the medicines of tomorrow."