?:definition
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Material physical anatomical entity in a gaseous, liquid, semisolid or solid state, with or without the admixture of cells and biological macromolecules; produced by anatomical structures or derived from inhaled and ingested substances that have been modified by anatomical structures as they pass through the body. Examples: saliva, semen, cerebrospinal fluid, inhaled air, urine, feces, blood, plasma, lymph.
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