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t-shirts allergen t-shirts allergens t-shirts betula pendula t-shirts electron micrographs t-shirts micrograph t-shirts micrographs t-shirts pollen t-shirts pollen grain t-shirts pollen grains t-shirts scanning electron micrographs t-shirts sem t-shirts sems t-shirts

photographs allergen photos allergens photos betula pendula photos electron micrographs photos micrograph photos micrographs photos pollen photos pollen grain photos pollen grains photos scanning electron micrographs photos sem photos sems photos

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Color enhanced scanning electron micrograph (SEM) of European white birch (Betula pendula) pollen grains. Pollen is the bearer of the plant's male genetic component. Pollen can cause allergies on skin and mucous membranes of sensitive persons. Pollination season is from April to May. Magnification 3200x.