Drill (<I>Mandrillus leucophaeus</I>) (IMAGE)

University of Arizona

Drill (<I>Mandrillus leucophaeus</I>)

Caption

Island-specific strains of the simian immunodeficiency virus (SIV), which infects monkeys such as the Bioko Drill, revealed the virus has been around thousands of years longer than previously thought.

Credit

Preston Marx, Tulane University

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