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Bronchoalveolar lavage (BAL) pepsin levels in seven patients with matched stable and acute exacerbation of idiopathic pulmonary fibrosis BAL samples. Each line represents one study subject. The closed circles and solid line represent the subject who had a high BAL pepsin level during the acute exacerbation. The open circles and dashed lines represent those subjects who had low BAL pepsin levels during their acute exacerbations.
