Usage History of 'chromoprotein'

The following chart shows how frequently 'chromoprotein' appeared in printed materials over time. For example, the word 'chromoprotein' occurred 6 times in books in 1909 and 84 times in 2008. From 1909 to 2008, the word 'chromoprotein' was used a total of 7,358 times in books scanned by Google. See Reference: Google Ngram project.

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