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ABSTRACT:
The prostaglandins are a family of lipids, originally discovered over 30 years ago in human seminal fluid, which have since been found not only to have a wide variety of striking pharmacological actions, but also to be present in many if not all mammalian tissues. They have an unusual chemical structure, being 20-carbon fatty acids derived enzymically from the essential fatty acids by cyclization and oxidation.
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http://www.pharmatutor.org/articles/prostaglandin-useful-strategy-new-drug-development-review
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