Cross section of maize, a C4 plant
Cross section of a C4 plant, specifically of a maize leaf. Drawing based on microscopic images courtesy of Cambridge University Plant Sciences Department.
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"400px-Cross_section_of_maize_a_C4_plant..jpg."
https://en.wikipedia.org/wiki/C4_carbon_fixation%23/media/File:Cross_section_of_maize,_a_C4_plant..jpg
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