Abstract
We consider the evidence that RA, the vitamin A metabolite, is involved in three fundamental aspects of the development of the CNS: 1) the stimulation of axon outgrowth in particular neuronal sub-types; 2) the migration of the neural crest; and 3) the specification of rostrocaudal position in the developing CNS (forebrain, midbrain, hindbrain, spinal cord). The evidence we discuss involves RA-induction of neurites in cell cultures and explants of neural tissue; the teratological effects of RA on the embryo's nervous system; the observation that RA can be detected endogenously in the spinal cord; and the fact that the receptors and binding proteins for RA are expressed in precise domains and neuronal cell types within the nervous system.
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