Usage History of 'pregnenolones'

The following chart shows how frequently 'pregnenolones' appeared in printed materials over time. For example, the word 'pregnenolones' occurred 6 times in books in 1950 and 2 times in 2008. From 1950 to 2008, the word 'pregnenolones' was used a total of 94 times in books scanned by Google. See Reference: Google Ngram project.

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