8441
Programmed DNA double - strand breaks ( DSBs ) that initiate meiotic recombination , catalyzed by Spo11 and accessory DSB proteins , form in loop sequences in promoters , whereas the DSB proteins are located on chromosome axes .
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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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