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This article on cytology is aimed toward developmental, mobile and molecular biologists, and biochemists. themes lined contain useful parts of microtubule organizing centres; and molecular and mobile foundation of formation, hardening and breakdown of the egg envelope in fish.
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Extra resources for International Review of Cytology, Vol. 136
1989) and may interact with tubulin (Balczon and Brinkley, 1987). Simerly et al. (1990) suggested that the CENP-B protein could be involved in either microtubule assembly at the kinetochore or in sliding of the kinetochore along the microtubules. ,1990). Injection of these purified IgGs into tissue culture cells disrupts microtubule attachment to kinetochores, chromosome congression, and chromosome segregation, depending on the stage of the cell cycle at the time of injection. The authors suggest that most of their results can be explained by defects in the assembly or maturation of the kinetochores such that either microtubules do not attach to the kinetochores or the attachment is defective.
Other investigators have also reported the presence of Ca2'-binding, contractile proteins in the centrosome, but have suggested other functions for the proteins. Baron et al. (1991) have suggested that the Ca2'-binding, centrosomal proteins in marsupial and mammalian cell lines, identified by antibodies raised against Tetraselmis centrin (Table I), may have contractile properties and be involved in the changes in the distribution of the PCM that occur during the cell cycle. Specifically, they suggest that these proteins could be involved in the interconversion of the PCM from satellites to fibrous halo and back to satellites.
Electron microscopic analysis of these cells shows that each cell contains two spbs. One appears normal and is responsible for assembly of the monopolar spindle. , 1991). MICROTUBULE-ORGANIZINGCENTERS 35 Among the five Drosophila mutations which appear to affect centrosome organization, asp is characterized by the assembly of disorganized and/or monopolar spindles. , 1990). The primary defect among the polo, aurora, and thule mutations appears to be a loss in integrity of the centrosomes/spindle poles such that the centrosome material, as detected by staining with a Drosophilaspecific, anti-centrosome antibody, Bx63 (Table 11), is more dispersed than normal.