BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY
Allergens. False-colour scanning electron micro- graph (SEM) of an assortment of substances which can cause an allergic reaction. Seen here among household dust, which is itself an allergen, are pollen grains (red, orange), smaller fungal spores and mould. These are all potential allergic substances found typically in the home. An allergy is a hypersensitive response to substances that, in most people, are harmless. They may come into contact with the skin, respiratory airways, or surface of the eye. The substances seen here are all to be found airborne in different quantities. Some allergens, for example pollen, are seasonal. Magnification unknown.
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