Usage History of 'ribozyme'

The following chart shows how frequently 'ribozyme' appeared in printed materials over time. For example, the word 'ribozyme' occurred 22 times in books in 1959 and 7,649 times in 2008. From 1959 to 2008, the word 'ribozyme' was used a total of 101,292 times in books scanned by Google. See Reference: Google Ngram project.

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