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Long-range optical coherence tomography image of the neonatal trachea, represented in a select region of Cartesian coordinates (A) and polar coordinates (B). Noise bands digitally removed for image clarity. Scale bar = 500 μm. BM = basement membrane; E = epithelium; ETT = endotracheal tube; S = sheath; SM = submucosa; T = tracheal cartilage.
