50021
By 1990 , it was recognized that gorillas and chimpanzees are more closely related to humans than they are to orangutans , leading to their ( gorillas and chimpanzees ) placement in subfamily Homininae as well .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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