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- Preprophase_band abstract "The preprophase band is a microtubule array found in plant cells that are about to undergo cell division and enter the preprophase stage of the plant cell cycle. Besides the phragmosome, it is the first microscopically visible sign that a plant cell is about to enter mitosis. The preprophase band was first observed and described by Jeremy Pickett-Heaps and Donald Northcote at Cambridge University in 1966.Just before mitosis starts, the preprophase band forms as a dense band of microtubules around the phragmosome and the future division plane just below the plasma membrane. It encircles the nucleus at the equatorial plane of the future mitotic spindle when dividing cells enter the G2 phase of the cell cycle after DNA replication is complete. The preprophase band consists mainly of microtubules and microfilaments (actin) and is generally 2-3 µm wide. When stained with fluorescent markers, it can be seen as two bright spots close to the cell wall on either side of the nucleus.Plant cells lack centrosomes as microtubule organizing centers. Instead, the microtubules of the mitotic spindle aggregate on the nuclear surface and are reoriented to form the spindle at the end of prophase. The preprophase band also functions in properly orienting the mitotic spindle, and contributes to efficient spindle formation during prometaphase The preprophase band disappears as soon as the nuclear envelope breaks down and the mitotic spindle forms, leaving behind an actin-depleted zone. However, its position marks the future fusion sites for the new cell plate with the existing cell wall during telophase. When mitosis is completed, the cell plate and new cell wall form starting from the center along the plane occupied by the phragmosome. The cell plate grows outwards until it fuses with the cell wall of the dividing cell at exactly the spots predicted by the position of the preprophase band.".
- Preprophase_band thumbnail Preprophaseband.png?width=300.
- Preprophase_band wikiPageID "9431554".
- Preprophase_band wikiPageLength "3529".
- Preprophase_band wikiPageOutDegree "23".
- Preprophase_band wikiPageRevisionID "544684941".
- Preprophase_band wikiPageWikiLink Category:Cell_cycle.
- Preprophase_band wikiPageWikiLink Category:Mitosis.
- Preprophase_band wikiPageWikiLink Category:Plant_cells.
- Preprophase_band wikiPageWikiLink Cell_cycle.
- Preprophase_band wikiPageWikiLink Cell_membrane.
- Preprophase_band wikiPageWikiLink Cell_nucleus.
- Preprophase_band wikiPageWikiLink Cell_plate.
- Preprophase_band wikiPageWikiLink Cell_wall.
- Preprophase_band wikiPageWikiLink Centrosome.
- Preprophase_band wikiPageWikiLink DNA_replication.
- Preprophase_band wikiPageWikiLink G2_phase.
- Preprophase_band wikiPageWikiLink Microfilament.
- Preprophase_band wikiPageWikiLink Microtubule.
- Preprophase_band wikiPageWikiLink Microtubule_organizing_center.
- Preprophase_band wikiPageWikiLink Mitosis.
- Preprophase_band wikiPageWikiLink Phragmosome.
- Preprophase_band wikiPageWikiLink Plant_cell.
- Preprophase_band wikiPageWikiLink Preprophase.
- Preprophase_band wikiPageWikiLink Spindle_apparatus.
- Preprophase_band wikiPageWikiLink Telophase.
- Preprophase_band wikiPageWikiLink University_of_Cambridge.
- Preprophase_band wikiPageWikiLink File:Preprophaseband.png.
- Preprophase_band wikiPageWikiLinkText "preprophase band".
- Preprophase_band subject Category:Cell_cycle.
- Preprophase_band subject Category:Mitosis.
- Preprophase_band subject Category:Plant_cells.
- Preprophase_band hypernym Array.
- Preprophase_band type Place.
- Preprophase_band type Cell.
- Preprophase_band comment "The preprophase band is a microtubule array found in plant cells that are about to undergo cell division and enter the preprophase stage of the plant cell cycle. Besides the phragmosome, it is the first microscopically visible sign that a plant cell is about to enter mitosis.".
- Preprophase_band label "Preprophase band".
- Preprophase_band sameAs Q3367749.
- Preprophase_band sameAs Banda_da_preprofase.
- Preprophase_band sameAs Predprofazni_prsten.
- Preprophase_band sameAs m.0288q85.
- Preprophase_band sameAs Препрофазная_лента.
- Preprophase_band sameAs Q3367749.
- Preprophase_band wasDerivedFrom Preprophase_band?oldid=544684941.
- Preprophase_band depiction Preprophaseband.png.
- Preprophase_band isPrimaryTopicOf Preprophase_band.