| http://www.w3.org/ns/prov#value | - Once the immune system detects an antigen such as pollen or pet dander, IgE triggers the release of histamine and other chemicals; these chemicals, produced by the body, are the actual cause of the familiar sneezing, itching, and watery eyes.1 billion Approximate number of pollen grains produced by a single ragweed plant each year.
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