By Kwang W. Jeon, Jonathan Jarvik
International assessment of Cytology offers present advances and complete experiences in mobile biology-both plant and animal. Articles deal with constitution and keep watch over of gene expression, nucleocytoplasmic interactions, keep watch over of mobile improvement and differentiation, and mobile transformation and development. Authored via a number of the superior scientists within the box, each one quantity presents updated info and instructions for destiny study.
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Extra resources for International Review of Cytology, Vol. 157
Jr. (1990). Microtubule-associated proteins from Antarctic fishes. Cell Motil. Cytoskel. 17, 174186. Detrich, H. W. 111, Fitzgerald, T. , Dinsmore, J. , and Marchese-Ragona, S. P. (1992). Brain and egg tubulins from Antarctic fishes are functionally and structurally distinct. J . Eiol. Chem. 267, 18766-18775. Drechsel, D. N . Hyman. A. , Cobb, M. , and Kirschner, M. W. (1992). Modulation of the dynamic instability of tubulin assembly by the microtubule-associated protein tau. Mol. Eiol. Cell 3, 1141-1 154.
Every pituitary cell has the capacity to divide during its life span, although the mitotic activity declines with aging (Takahashi and Kawashima, 1986). Differentiation of pituitary cells is not incompatible with mitosis, because mitotic figures of differentiated pituitary cells, which could be detected immunocytochemically, are encountered at any age in the rat and mouse. Pituitary cells divide into the same differentiated cells (simple duplication). Alternatively, daughter cells may turn into another type of cell.
Addition of the mimosa tubulin to goat tubulin induced a coldstability in these hybrid microtubules, again indicating that not all tubulin dimers must necessarily have this intrinsic ability to be cold stable in order to induce a cold stability in the whole microtubule structure. An altered proportion of isotypes with different degrees of stability can therefore affect the whole microtubule. In suspension-cultured tobacco (Nicotiana rabacum) cells the amount of cold-stable microtubules was proposed to be regulated by the action of a phosphorylation/dephosphorylation system (Mizuno, 1992).