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Total hydroxyproline per lung immediately after and 21 days after the end of inhalation challenge. Data are presented as Mean + SEM and are representative of two such experiments. n = 6/group. * p<0.05 LPS vs. Saline (significant difference due to inhalation challenge); # p<0.05 Silica vs. Saline (significant difference due to silica instillation or combined Silica and LPS).
