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Ragweed pollen grains, SEM

Ragweed pollen grains, SEM

C002/6317

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50.0 MB (2.7 MB compressed)

5120 x 3413 pixels

43.4 x 29.0 cm ⏐ 17.1 x 11.4 in (300dpi)

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Credit

MARTIN OEGGERLI / SCIENCE PHOTO LIBRARY MARTIN OEGGERLI / SCIENCE PHOTO LIBRARY

Caption

Ragweed (Ambrosia sp.) pollen grains (yellow) sticking to an anther, scanning electron micrograph (SEM). Pollen grains are reproductive structures produced by the male parts of flowering plants. Ragweed releases 1.6 million pollen grains per hour, which are highly allergic and a major contributor to hayfever.

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