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Collagen expression in lung according to age in the acute asthma model. Representative photomicrographs of lung sections stained for collagen III (A) (original magnification × 200) and hydroxyproline concentration in lung tissue (B).
Notes: Values shown are mean ± SEM (n = 8–12/group); *P< 0.05, compared with the 6-week-old OVA group.
Abbreviations: W, weeks; wk, weeks; M, months; OVA, ovalbumin; SEM, standard error of the mean.
