Usage History of 'endosymbiont'

The following chart shows how frequently 'endosymbiont' appeared in printed materials over time. For example, the word 'endosymbiont' occurred 2 times in books in 1948 and 1,350 times in 2008. From 1948 to 2008, the word 'endosymbiont' was used a total of 22,845 times in books scanned by Google. See Reference: Google Ngram project.

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