Silver birch pollen, SEM

Silver birch pollen, SEM

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Credit: BIOMEDICAL IMAGING UNIT, SOUTHAMPTON GENERAL HOSPITAL/SCIENCE PHOTO LIBRARY

Caption: Silver birch pollen grain. Coloured scanning electron micrograph (SEM) of a pollen grain from the flower of silver birch (Betula pendula). The outer wall of the grain (exine) has three pores. Silver birch pollen causes an allergic reaction in around a quarter of hay fever sufferers. Magnification: x4318 when printed at 10 centimetres wide.

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Keywords: 1, allergen, allergenic, allergy, betula pendula, biological, biology, botanical, botany, coloured, false-coloured, flora, gamete, grain, hayfever, nature, one, plant, plants, pollen, porate, pore, pores, reproduction, reproductive, scanning electron micrograph, scanning electron microscope, sem, silver birch, single, triporate

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