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Maybe a fact, maybe not. Definitely a socially-constructed fact. Some solid, though not well-publicized data suggest it is actually a non-fact (e.g., Djian and Green, PNAS, 86:8447, 1989; Livak et al., PNAS, 92:427, 1995). The problem is that those who invested most heavily in Sibley in the 1980s and are embarrassed by the fact that those data did not show what they purported to show (a clear human-chimp link), are now arguing that it doesn't matter, because other data show human-chimp. Of ocurse, some data do show human-chimp, but there is nothing like a concordance.
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