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  2. Cell polarity - Wikipedia

    en.wikipedia.org/wiki/Cell_polarity

    In yeast, polarity is biased to form at an inherited landmark, a patch of the protein Rsr1 in the case of budding, or a patch of Rax1 in mating projections. [9] In the absence of polarity landmarks (i.e. in gene deletion mutants), cells can perform spontaneous symmetry breaking, [10] in which the location of the polarity site is determined ...

  3. Polar organelle - Wikipedia

    en.wikipedia.org/wiki/Polar_organelle

    A polar organelle is a structure at a specialised region of the bacterial polar membrane that is associated with the flagellar apparatus. [ 1 ] [ 2 ] This flagellum-associated structure can easily be distinguished from the other membrane regions in ultrathin sections of embedded bacteria by electron microscopy when the cell membrane is ...

  4. Epithelial polarity - Wikipedia

    en.wikipedia.org/wiki/Epithelial_polarity

    These molecules appear to form two distinct complexes: an aPKC-Par3-Par6 "aPKC" (or "Par") complex that also interacts with Cdc42; and a Crumbs-Stardust-PATJ "Crumbs" complex. Of these two complexes, the aPKC complex is the most important for epithelial polarity, being required even when the Crumbs complex is not.

  5. Polar surface area - Wikipedia

    en.wikipedia.org/wiki/Polar_surface_area

    Electrical potential surface of paracetamol showing polar areas in red and blue. The polar surface area (PSA) or topological polar surface area (TPSA) of a molecule is defined as the surface sum over all polar atoms or molecules, primarily oxygen and nitrogen, also including their attached hydrogen atoms.

  6. Mesenchymal–epithelial transition - Wikipedia

    en.wikipedia.org/wiki/Mesenchymal–epithelial...

    Unlike epithelial cells – which are stationary and characterized by an apico-basal polarity with binding by a basal lamina, tight junctions, gap junctions, adherent junctions and expression of cell-cell adhesion markers such as E-cadherin, [4] mesenchymal cells do not make mature cell-cell contacts, can invade through the extracellular matrix, and express markers such as vimentin ...

  7. Aster (cell biology) - Wikipedia

    en.wikipedia.org/wiki/Aster_(cell_biology)

    At the negative ends of the aster centrosomes will nucleate (form a nucleus) and anchor to the microtubules. At the positive end, polymerization of the aster will occur. Cortical dynein, a motor protein, moves along the microtubules of the cell and plays a key role in the growth and inhibition of aster microtubules.

  8. Polarized membrane - Wikipedia

    en.wikipedia.org/wiki/Polarized_membrane

    Polarized membranes are key cellular components that aid in facilitating compartmentalization, cell-to-cell communication, and signaling. Cells actively utilize polarized membranes to form and maintain electrochemical gradients and regulate both intracellular and extracellular environments.

  9. Polarity in embryogenesis - Wikipedia

    en.wikipedia.org/wiki/Polarity_in_embryogenesis

    An oocyte with poles depicted. In developmental biology, an embryo is divided into two hemispheres: the animal pole and the vegetal pole within a blastula.The animal pole consists of small cells that divide rapidly, in contrast with the vegetal pole below it.

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