Scanning electron microscope image of pollen grains from Helianthus annuus (common sunflower). This image is in the public domain. http://remf.dartmouth.edu/images/botanicalPollenSEM/source/10.html
Scanning electron microscope image of pollen grains from Helianthus annuus (common sunflower). This image is in the public domain. http://remf.dartmouth.edu/images/botanicalPollenSEM/source/10.html
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