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At midgestation , the telencephalic vesicles are characterized by well developed radial glia cells ( RGCs ) , the first differentiated astrocytes and a basic vascular network mainly built of radial vessels .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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