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Aspirin and some other NSAIDs inhibit cyclooxygenase which is the first enzyme in the prostaglandin/thromboxane biosynthesis pathway if you consider first substance is arachidonic acid (a fatty acid). Generally, arachidonic acid is present in the form of a phospholipid, and if you consider that in the pathway, substance-Y is arachidonic acid and enzyme-A is ...

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