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Using total internal reflection fluorescence ( TIRF ) - coupled photobleaching - assisted copy - number counting of single nucleosomes obtained from cultured cells , we find that the majority of CENP - A nucleosomes contain CENP - A dimers .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
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