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Medicines. A Drug Is Any Substance Containing A Chemical Which Binds With A Receptor In A Cell Membrane Or An Enzyme Which Produces Some Biological Effect By Altering The Cellular Functions As A Result Of That Binding.

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Medicines. A drug is any substance containing a chemical which binds with a receptor in a cell membrane or an enzyme which produces some biological effect by altering the cellular functions as a result of that binding.

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