Usage History of 'collagen'

The following chart shows how frequently 'collagen' appeared in printed materials over time. For example, the word 'collagen' occurred 4 times in books in 1785 and 118,412 times in 2008. From 1785 to 2008, the word 'collagen' was used a total of 3,865,919 times in books scanned by Google. See Reference: Google Ngram project.

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