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Anatomy and Neurobiology, College of Medicine, University of Tennessee, Memphis 38163.
The idea that microenvironmental cues act alone late in development to determine a cell's phenotype has dominated recent discussion of, retinal development, and has successfully displaced the notion of any role for cell lineage in the process of cell determination. We argue that there is, in fact, evidence favoring a degree of lineage restriction during the development of the vertebrate retina. We propose that environmental factors modulate a process of progressive lineage restriction. In this model, progenitor cells are viewed as having unequal potential, and their progeny are viewed as being committed to one of the major retinal cell classes before the stage at which they become postmitotic.
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