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• W3048166419 abstract "The pinnipeds’ placenta has been described as zonary, annular, labyrinthic and endotheliochorial, like that of the terrestrial carnivores. This article describes the placenta of Mirounga leonina, a phocid pinniped, focusing on some morphological features related to fetal nutrition. Placental samples from three elephant seals were collected and conditioned after natural delivery at the Antarctic Specially Protected Area 132. Histological and ultrastructural studies were conducted; cytokeratins, vimentin, α-smooth muscle actin, and desmin proteins were detected using immunohistochemistry. The placentas were zonary, lobed, belt-shaped, and showed multiple vivid orange areas, which corresponded to bilirubin crystalline pigment found among chorionic villi and inside trophoblast cells. In the labyrinth, cytotrophoblast cells were isolated and there was a scant syncytium interposed between maternal and fetal vessels. Fetal vessels were small, round, and frequently intratrophoblastic, while maternal vessels were large, irregular, sinuous, and thin-walled. Vimentin and actin were detected in some scattered non-vascular cells throughout the labyrinth. Broad areas of degenerated and necrotic maternal components were also observed. The placentas of pinniped and fissiped carnivores share several traits. However, some remarkable features might maximize respiratory efficiency, collaborating to endure deep-diving hypoxia. Some of them, as the notably large sinuous maternal capillaries and fetal capillary indentation into the syncytium, are shared, e.g., by Phocidae and Mustelidae. Besides hemotropic nutrition taking place through an extremely narrow barrier, the abundant necrotic material and hematic products might allow substantial endocytosis of detritus even in term placentas, in this species giving birth to precocious offspring." @default.
• W3048166419 created "2020-08-13" @default.
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• W3048166419 date "2020-10-01" @default.
• W3048166419 modified "2023-10-10" @default.
• W3048166419 title "Term placenta of the southern elephant seal (Mirounga leonina)" @default.
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• W3048166419 doi "https://doi.org/10.1016/j.placenta.2020.07.031" @default.
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