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A: a truncated dissolved-phase spectrum from a representative healthy volunteer and a subject with idiopathic pulmonary fibrosis (IPF). Compared with the healthy volunteer, this IPF subject exhibits a 2.9-fold reduction in the RBC:barrier ratio. B: for all subjects the RBC:barrier ratio was 0.55 ± 0.13 in the healthy volunteers but was 3.3-fold lower in the IPF patients (0.16 ± 0.03; *P = 0.0002).
