26070
In the precursors of platelets and erythrocytes , as well as in monocytes , we found that open chromatin signatures reflect the corresponding hematopoietic lineages of the studied cell types , and associate with the cell type - specific gene expression patterns .
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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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