16047
Underwound domains are transcriptionally active and enriched in topoisomerase I , ' open ' chromatin fibers and DNase I sites , but they are depleted of topoisomerase II .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None