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3D rendering of centrioles showing the triplets. In cell biology a centriole is a cylindrical organelle composed mainly of a protein called tubulin. [1] Centrioles are found in most eukaryotic cells, but are not present in conifers (), flowering plants (angiosperms) and most fungi, and are only present in the male gametes of charophytes, bryophytes, seedless vascular plants, cycads, and Ginkgo.
Description: A training booket prepared for an edit-a-thon. The source odt is available by emailing the author. This booklet fulfills the need of students, who attend the course but need extensive notes to take home.
[6] [7] [8] During S and G2 phases of the cell cycle, the procentrioles elongate until they reach the length of the older mother and daughter centrioles. At this point, the daughter centriole which takes on characteristics of a mother centriole. Once they reach full length, the new centriole and its mother centriole form a diplosome.
The microtubule-organizing center (MTOC) is a structure found in eukaryotic cells from which microtubules emerge. MTOCs have two main functions: the organization of eukaryotic flagella and cilia and the organization of the mitotic and meiotic spindle apparatus, which separate the chromosomes during cell division.
They are defined as any microtubule originating from the centrosome which does not connect to a kinetochore. [3] Astral microtubules develop in the actin skeleton and interact with the cell cortex to aid in spindle orientation. They are organized into radial arrays around the centrosomes.
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Centrin-3 is a protein that in humans is encoded by the CETN3 gene. [4] [5] It belongs to the centrin family of proteins. The protein encoded by this gene contains four EF-hand calcium binding domains, and is a member of the centrin protein family. Centrins are evolutionarily conserved proteins similar to the CDC31 protein of S. cerevisiae.
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