Oak (Quercus) pollen is one of many airborne pollen grains that may cause an allergic reaction in humans. SEM.
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Oak (Quercus) pollen is one of many airborne pollen grains that may cause an allergic reaction in humans. SEM.

Filename: 110252.jpg
Photographer: Simko .
Source: Visuals Unlimited, Inc.
Date: 1 Jan 2007
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Credit: Simko/Visuals Unlimited, Inc.
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