Origin and function of the yolk sac in primate embryogenesis | Nature Communications
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The comparative physiology of respiratory mechanisms. Respiration. RESPIRATION IN AIR 73 slightly developed only, from the anterior air-sacs. They are absent in penguins (Vos, 1937). Provided a sufficient number of microscopic
Thecal sac - Wikipedia
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Sacs à Dos Femme & Sac à Dos Cuir | Lancaster
Frontiers | The Peritoneum: Beyond the Tissue – A Review