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ry a ill, revis ne 2 and glia in vivo at the single-cell level throughout the entire Developmental Biology 294 (The formation of the mature CNS with its diverse assortment of neurons and glia is a complex process that requires a large number of interacting proteins functioning throughout devel-opment. Studying this process involves examining how cells acquire their specific fates, divide, migrate, die, extend axons and dendrites, form synapses, and carry-out specific neuro-physiological functions. Recent progress on a variety of model systems has utilized genomic techniques to study neural and glial development and function (for example: Blackshaw et al.