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Elevated extracellular uridine-5′-diphosphate (UDP) levels in bleomycin-induced pulmonary fibrosis. Male C57Bl/6 mice received an i.t. injection of BLM or vehicle on day 0. Animals were killed at the indicated time points, and UDP levels were measured in the bronchoalveolar lavage fluid (n = 4–6 per group) (**p < 0.01; ***p < 0.001).
