Usage History of 'protonematal'

The following chart shows how frequently 'protonematal' appeared in printed materials over time. For example, the word 'protonematal' occurred 24 times in books in 1938 and 10 times in 2006. From 1938 to 2006, the word 'protonematal' was used a total of 456 times in books scanned by Google. See Reference: Google Ngram project.

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