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Evolution

Humans are evolutionarily most closely related to the African great apes, sharing nearly 99% genetic identity with Pan troglodytes (the chimpanzee) and Pan paniscus (the bonobo) and a somewhat lesser identity wth Gorilla gorilla (the gorilla) and Pongo pygmaeus (the orangutan) [1].

Reference:
[1] Takahata N. and Satta Y., PNAS, 94, 4811-4815 (1997). PMID: 9114074