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1) Hydroxyproline content of human lung increases with age. 2) The collagen content of human lung increases with age. 3) The lipid content of human lung decreases with age. 4) The shrinking temperature of human pleura increases with age. 5) The hydroxyproline content of collagen isolated from human pleura increases with age.
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Briscoe et al. (1959) studied this question.
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