Usage History of 'porphyrins'

The following chart shows how frequently 'porphyrins' appeared in printed materials over time. For example, the word 'porphyrins' occurred 2 times in books in 1798 and 4,465 times in 2008. From 1798 to 2008, the word 'porphyrins' was used a total of 237,095 times in books scanned by Google. See Reference: Google Ngram project.

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