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特許 係属中 LTC4, LTD4, LTE4 and LTF4 are often called cysteinyl leukotrienes due to the presence of the amino acid cysteine in their structure. The cysteinyl leukotrienes make up the slow-reacting substance of anaphylaxis (SRS-A). LTF4, like LTD4, is a metabolite of LTC4, but, unlike LTD4, which lacks the glutamic residue of glutathione, LTF4 lacks the glycine residue of glutathione.