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Inhaled pollen grains, illustration
Illustration of inhaled pollen grains in the windpipe (trachea). Pollen grains are allergens and can cause hay fever (allergic rhinitis) when inhaled., by NEMES LASZLO/SCIENCE PHOTO LIBRARY
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724 x 478 px
6.1 x 4 cm
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2290 x 1511 px
19.4 x 12.8 cm
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6303 x 4160 px
53.4 x 35.2 cm
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