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(A,B) Photomicrograph showing the constitution of the pulmonary intersegmental septum (stain, H&E). The intersegmental septum is composed of superficial layers (white arrows) and a deep layer (black asterisk). (A) The interlobular septum (black arrow) originates from the intersegmental septum, and the arrowhead shows its origin. (B) A Kohn's pore (black arrow) is seen on the alveolar wall.
