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These methods are beginning to be applied to the area of neuroproteomics , but the central nervous system poses many specific challenges in terms of quantitative proteomics , given the large number of different neuronal cell types that are intermixed and that exhibit distinct patterns of gene and protein expression .
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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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