From cell to cell within a given tissue, variability exists. Single-cell sequencing technologies from 10X Genomics is helping researchers and drug developers understand cellular diversity in tissue once thought to be made up of homogenous populations. This has the potential to lead to new understandings of diseases, open up new targets for drug developers, and provide for more tailored approaches to the treatment of diseases. We spoke to Michael Schnall-Levin, chief technology officer and founding scientist of 10X Genomics, about the company’s platform technologies, the diversity of the cellular populations within the body, and how this is changing our understanding of health and disease.