6349
During the past decade , different types of endogenous retroviral sequences have been defined in the human genome usually by low stringency hybridization employing DNA probes of evolutionary conserved animal retrovirus genes .
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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: GENE 
Text: {0} 
 Entities:  
Answer:
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