Usage History of 'psoralens'

The following chart shows how frequently 'psoralens' appeared in printed materials over time. For example, the word 'psoralens' occurred 2 times in books in 1860 and 808 times in 2008. From 1860 to 2008, the word 'psoralens' was used a total of 30,067 times in books scanned by Google. See Reference: Google Ngram project.

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