People tend to think of each person having their own unique genome. Quotient Therapeutics is taking an approach to drug discovery based on the reality that from cell to cell within a given individual, there can be trillions of divergent genomes. Changes in cells throughout the body can alter how a cell responds to disease and point to new ways to cure, treat, or prevent conditions. We spoke to Jacob Rubens, president of Quotient, about the company’s platform technology, how it tests genetic mutations at a cellular level, and its efforts to build a pipeline of therapies around the insights it gains.