Usage History of 'protoplasts'

The following chart shows how frequently 'protoplasts' appeared in printed materials over time. For example, the word 'protoplasts' occurred 2 times in books in 1659 and 4,596 times in 2008. From 1659 to 2008, the word 'protoplasts' was used a total of 529,877 times in books scanned by Google. See Reference: Google Ngram project.

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