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Western blot analysis of APOE in BALF and serum samples. Statistical analysis was performed by Kruskal–Wallis test and Dunn correction and reported in the box plots for CTRL–IPF–LC-IPF (∗ p-value < 0.05). Ponceau red is reported to assure the equal loaded amount of sample and for the intensity normalization. BALF and serum samples used for WB were three for CTRL, three for IPF, and three for LC-IPF.
