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Figure 4. Immature lung in the canalicular (acinar) phase. Photomicrograph (original magnification, x425; H-E stain) of the lungs shows blood-filled capillaries (arrow) that lie immediately beneath the surface of alveolar duct structures lined by cuboidal epithelium (early type II pneumocytes (arrowhead). (Reprinted, with permission, from reference 6.)
