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The cellular sequences 5 ' to the viral integration site exhibited 85 to 97 % identity to several sequences belonging to the mouse L1 family of long interspersed repetitive sequences .
 mouse L1 family
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 mouse L1 family