The Cepko lab investigates the mechanisms that direct development of the central nervous system (CNS) of vertebrates, with a focus on the retina. These studies have revealed that the retina has distinct types of progenitor cells that are biased, or committed, to produce distinct types of daughter cells in terminal divisions. The gene regulatory networks that underlie these cell fate choices are being studied by analysis of both gene function and cis-regulatory networks. New methods that enable these studies have been developed, including high throughput enhancer assays and quantitative, inexpensive and sensitive multiplex in situ hybridization methods.