Lungs were fixed in formalin for histologic analysis or used for bronchial alveolar lavage (BAL) collection (18 (link)). Sections were processed for H&E staining or immunohistochemistry staining with antibodies to CPT1 (8F6AE9 Abcam; 1:100) or HADHA (ab54477 Abcam; 1:500). Some sections were also stained with antibodies to CPT1 or HADHA together with F4/80 (SP115 Abcam; 1:100), Ly-6G (RB6–8C5 ebioscience; 1:500), Siglec-F (E50–2440 BD Biosciences; 1:500), or CD45R (RA3–6B2; BD Biosciences; 1:500). Protocols were described previously (7 (link)). BAL fluids were subjected to cytospin and stained with Diff-Quik (IMEB).