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The researchers could study only 16 samples of lung biopsies obtained from people who had undergone biopsies for separate medical reasons because obtaining lung biopsies raises ethical concerns

They should instead use existing resources to help smokers quit and persuade non-smokers never to start

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Oxidative damage of proteins was also measured by sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) of guinea lung microsomal proteins as described before (4)

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