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[2] [9] Homogeneous leukoplakia is usually slightly elevated compared to surrounding mucosa, and often has a fissured, wrinkled or corrugated surface texture, [2] with the texture generally consistent throughout the whole lesion

Again, the body is really, really clever

1930's Philip Morris Round Tin, above photo

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Caldicott DG, Chow FY, Burns BJ, Felgate PD, Byard RW