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RGCs have been recognized to contribute to cerebral cortex neuro - vascular architecture and have also been demonstrated to act as a significant source of neural cells ( Rakic , Brain Res 33 : 471 - 476 , 1971 ; Malatesta et al , Development 127 : 5253 - 5263 , 2000 ) .
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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:
 None