Usage History of 'photosystem'

The following chart shows how frequently 'photosystem' appeared in printed materials over time. For example, the word 'photosystem' occurred 6 times in books in 1929 and 14,864 times in 2008. From 1929 to 2008, the word 'photosystem' was used a total of 235,257 times in books scanned by Google. See Reference: Google Ngram project.

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