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In aged animals , URB597 increased RGC survival at 1 week , but not at 2 weeks post - axotomy and had no effect on microglia .
 Chemical: URB597
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: URB597