| http://www.w3.org/ns/prov#value | - In the pathology of allergic diseases two types of tissue changes are observed: (1) the reversible and (2) the irreversible.REVERSIBLE TISSUE CHANGES The reversible tissue changes, which are induced by such antigens as pollens, epidermals, foods, serums and drugs, are characterized by edema, smooth muscle spasm and stimulation of glands.
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