File:A, Transverse section through the yolk-sac and stalk of a 5 mm. pig embryo showing attachment of amnion. B, Diagram of the fetal membranes and allantoic placenta of a pig embryo in median.jpg
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![File:A, Transverse section through the yolk-sac and stalk of a 5 mm. pig embryo showing attachment of amnion. B, Diagram of the fetal membranes and allantoic placenta of a pig embryo in median.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/8/8a/A%2C_Transverse_section_through_the_yolk-sac_and_stalk_of_a_5_mm._pig_embryo_showing_attachment_of_amnion._B%2C_Diagram_of_the_fetal_membranes_and_allantoic_placenta_of_a_pig_embryo_in_median.jpg/426px-thumbnail.jpg?20240412133542)
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