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A) Phosphatidylcholine in healthy controls, B) Phosphatidylcholine in ARDS patients, C) Lysophosphatidylcholine in healthy controls, D) Lysophosphatidylcholine in ARDS patients, E) Sphingomyelin in healthy controls and F) Sphingomyelin in ARDS patients. Dotted line represents the time when equilibrium achieved between plasma and erythrocytes.
