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We have one entry that includes the term Substance of.
slow-reacting substance of anaphylaxis
noun: a mixture of three leukotrienes produced in anaphylaxis that causes contraction of smooth muscle after minutes in contrast to histamine which acts in seconds and that is probably responsible for the bronchoconstriction occurring in anaphylaxis —abbreviation SRS-A
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Merriam-Webster unabridged





