Usage History of 'zymogen'

The following chart shows how frequently 'zymogen' appeared in printed materials over time. For example, the word 'zymogen' occurred 20 times in books in 1876 and 2,507 times in 2008. From 1876 to 2008, the word 'zymogen' was used a total of 122,073 times in books scanned by Google. See Reference: Google Ngram project.

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