nervous system
• increased proliferation of cells by E10
• 110% at E11 to 300% at E11.5
• E11 proliferation rate increased 1.4X
• 6.7% increase in progenitor cell death and apoptosis
• lower proportion of differentiated neurons to proliferative cells
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• changes similar to those seen in the spinal cord
• tissue mass of the midbrain was increased
• increased proliferation in all areas of the brain
• progenitor domains of the midbrain and other areas of the brain increased
• increased apoptosis
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• enlarged ventricular zone at E10.5
• increased area occupied by neural progenitor cells
• smaller area occupied by differentiated neurons (as determined immunohistochemically and by activity of genes expressed in progenitor cells)
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