The Raj lab studies the biology of single cells. The primary motivation for studying biological processes on a cell-by-cell basis is the fact that even genetically identical cells can behave very differently. This variability can have consequences in a variety of biological contexts. We aim to understand these differences at the molecular level. They develop and utilize a mix of experimental tools including individual RNA molecules via fluorescence microscopy, high throughput sequencing and molecular biology to make quantitative measurements of cellular behavior. They aim to foster a richly interdisciplinary research environment in which biologists, chemists, engineers, clinicians, physicists, computer scientists, and mathematicians can work together to solve exciting problems.