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Simian immunodeficiency virus present in chimpanzees is reportedly derived from older strains of the virus present in the collared mangabey ( " Cercocebus torquatus " ) and the putty-nosed monkey .
 Simian immunodeficiency virus, collared mangabey
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
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Answer:
 Simian immunodeficiency virus, collared mangabey