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Fresh specimens, about 1mm3 in size, were obtained from the epithelium with the underlying lamina propria and submucosa of the bronchi and lung tissue with the bronchioles were immediately fixed in 4F 1G (2% formaldehyde, 1.25% gluteraldehyde in 0.1 M sodium cacodylate, PH 7.2) and stored at 4°C. Depending on histological finding, the specimens of the 4 years camels (the camels with well-developed BALT) were processed as outlined by Woods and Stirling (2019). For details, see Zidan and Pabst (2009). Semithin sections (1μm) were stained with toluidine blue and examined with the light microscope. Suitable areas for the electron microscopic examination were determined. Ultrathin sections (60–100 nm) were stained with uranyl acetate followed by lead citrate. The sections were examined with 100 CX JEOL transmission electron microscope working at 80 KVs

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