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PMAT may refer to: . Plasma membrane monoamine transporter (PMAT); Four phases of mitosis: prophase, metaphase, anaphase, and telophase: . Prophase: Chromatin into chromosomes, the nuclear envelope break down, chromosomes attach to spindle fibers by their centromeres.
Mitotic cell division enables sexually reproducing organisms to develop from the one-celled zygote, which itself is produced by fusion of two gametes, each having been produced by meiotic cell division. [5] [6] After growth from the zygote to the adult, cell division by mitosis allows for continual construction and repair of the organism. [7]
The inner two layers, (1 and 2) are magnocellular cell (M cell) layers, while the outer four layers, (3,4,5 and 6), are parvocellular cell (P cell) layers. An additional set of neurons, known as the koniocellular cell (K cell) layers, are found ventral to each of the M cell and P cell layers.
The relatively brief M phase consists of nuclear division (karyokinesis) and division of cytoplasm (cytokinesis). It is a relatively short period of the cell cycle. M phase is complex and highly regulated. The sequence of events is divided into phases, corresponding to the completion of one set of activities and the start of the next.
Mitosis is the division of somatic cells into two daughter cells. Durations of the cell cycle and mitosis vary in different cell types. An elevated mitotic index indicates more cells are dividing. In cancer cells, the mitotic index may be elevated compared to normal growth of tissues or cellular repair of the site of an injury. [2]
G 1 phase is particularly important in the cell cycle because it determines whether a cell commits to division or to leaving the cell cycle. [2] If a cell is signaled to remain undivided, instead of moving onto the S phase, it will leave the G 1 phase and move into a state of dormancy called the G 0 phase. Most nonproliferating vertebrate cells ...
This cell potency means that some cells can be removed from the preimplantation embryo and the remaining cells will compensate for their absence. This has allowed the development of a technique known as preimplantation genetic diagnosis , whereby a small number of cells from the preimplantation embryo created by IVF , can be removed by biopsy ...
Maturation-promoting factor (abbreviated MPF, also called mitosis-promoting factor or M-Phase-promoting factor) is the cyclin–Cdk complex that was discovered first in frog eggs. [ 1 ] [ 2 ] It stimulates the mitotic and meiotic phases of the cell cycle .