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Imaging of the trachea with microscopic optical coherence tomography (mOCT) in vivo. A: scheme of the intravital mOCT setup. B–D: intravital imaging of mouse trachea over the length of 5 mm (B) and with higher magnification (C). The inset (D) shows the epithelium, the periciliary liquid (PCL), and the overlying mucus layer in higher magnification. E: semithin section of the murine trachea for comparison. Scale bars: 500 µm in B and 100 µm in C and E.
