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Zebrafish embryo 48 hours after fertilization. The arrows indicate four Rohon–Beard neurons. [1] Rohon–Beard cells are specialized primary neurons with mechanoreceptive properties. [2] [3] They occur during the embryonic stage of development and are found in the dorsal part of the spinal cord in fishes and amphibians.
The second cell population is the enveloping layer which is made of superficial cells from the blastoderm that eventually form a single epithelial cell layer. [1] This layer functions in protection by allowing the embryo to develop in a hypotonic solution so the cell will not burst. [5] Finally, the third set of blastomeres are the deep cells.
In situ hybridizations of genes expressed in arteries (top) and veins (bottom) in zebrafish. Blue staining indicates presence of the gene mRNAs. Panels on the left are normal animals, while animals on the right are mutated in the Notch gene. Fish lacking Notch have fewer arteries and more veins at this point in developmental time.
The zebrafish (Danio rerio) is a species of freshwater ray-finned fish belonging to the family Danionidae of the order Cypriniformes.Native to South Asia, [3] it is a popular aquarium fish, frequently sold under the trade name zebra danio [4] (and thus often called a "tropical fish" although it is both tropical and subtropical).
In situ hybridization (ISH) is a type of hybridization that uses a labeled complementary DNA, RNA or modified nucleic acid strand (i.e., a probe) to localize a specific DNA or RNA sequence in a portion or section of tissue or if the tissue is small enough (e.g., plant seeds, Drosophila embryos), in the entire tissue (whole mount ISH), in cells ...
The Zebrafish Information Network is an online biological database of information about the zebrafish (Danio rerio). The zebrafish is a widely used model organism for genetic , genomic , and developmental studies, and ZFIN provides an integrated interface for querying and displaying the large volume of data generated by this research. [ 2 ]
VE-cadherin is indispensable for proper vascular development – there have been two transgenic mouse models of VE-cadherin deficiency, both embryonic lethal due to vascular defects. [ 10 ] [ 11 ] Further studies using one of these models revealed that although vasculogenesis occurred, nascent vessels collapsed or disassembled in the absence of ...
From that point, it begins to divide to form a plant embryo through the process of embryogenesis. As this happens, the resulting cells will organize so that one end becomes the first root, while the other end forms the tip of the shoot. In seed plants, the embryo will develop one or more "seed leaves" . By the end of embryogenesis, the young ...