8433
Here we report that the abundance of neural progenitors is normal in Csb ( - / - ) mice and the frequency of apoptotic cells in the neurogenic niche of the adult subependymal zone is similar in Csb ( - / - ) and wild type mice .
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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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