9405
Here , to understand the chromatin landscape of piRNA clusters and how piRNA precursors are generated , we analyzed the transcriptome , transcription start sites ( TSSs ) and the chromatin landscape of the BmN4 cell line , which harbors the germ - line piRNA pathway .
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Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None