?:definition
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Immunoassay reagents intended to perform qualitative and/or quantitative analyses on a body fluid sample (typically serum) to determine the neuroendocrine hormone substance P (SP), a peptide secreted by the endocrine glands of the gastrointestinal tract and also by the brain. Substance P acts as a neurotransmitter and analgesic; its action includes gastrointestinal contraction, promotion of salivation, and release of histamine.
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