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• W2079937152 endingPage "e106977" @default.
• W2079937152 startingPage "e106977" @default.
• W2079937152 abstract "Hypocretin/Orexin (H/O) neuropeptides are released by a discrete group of neurons in the vertebrate hypothalamus which play a pivotal role in the maintenance of waking behavior and brain state control. Previous studies have indicated that the H/O neuronal development differs between mammals and fish; H/O peptide-expressing cells are detectable during the earliest stages of brain morphogenesis in fish, but only towards the end of brain morphogenesis (by ∼ 85% of embryonic development) in rats. The developmental emergence of H/O neurons has never been previously described in birds. With the goal of determining whether the chick developmental pattern was more similar to that of mammals or of fish, we investigated the emergence of H/O-expressing cells in the brain of chick embryos of different ages using immunohistochemistry. Post-natal chick brains were included in order to compare the spatial distribution of H/O cells with that of other vertebrates. We found that H/O-expressing cells appear to originate from two separate places in the region of the diencephalic proliferative zone. These developing cells express the H/O neuropeptide at a comparatively early age relative to rodents (already visible at 14% of the way through fetal development), thus bearing a closer resemblance to fish. The H/O-expressing cell population proliferates to a large number of cells by a relatively early embryonic age. As previously suggested, the distribution of H/O neurons is intermediate between that of mammalian and non-mammalian vertebrates. This work suggests that, in addition to its roles in developed brains, the H/O peptide may play an important role in the early embryonic development of non-mammalian vertebrates." @default.
• W2079937152 created "2016-06-24" @default.
• W2079937152 creator A5009926871 @default.
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• W2079937152 creator A5048828046 @default.
• W2079937152 creator A5050764453 @default.
• W2079937152 creator A5051137314 @default.
• W2079937152 date "2014-09-04" @default.
• W2079937152 modified "2023-09-27" @default.
• W2079937152 title "Early Expression of Hypocretin/Orexin in the Chick Embryo Brain" @default.
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• W2079937152 doi "https://doi.org/10.1371/journal.pone.0106977" @default.
• W2079937152 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4154820" @default.
• W2079937152 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/25188307" @default.
• W2079937152 hasPublicationYear "2014" @default.
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