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Time dependence of exogenous surfactant DPPC enrichment in mouse lung BALF (A) and in the lavaged lung (B). Results were calculated by normalizing [U13C]DPPC enrichments for the 13C enrichment of DPPC in the administered surfactant. Results are presented as means ± SEMs. *P < 0.05, †P < 0.01, and ‡P <0.001, unpaired t-test.
