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| Premature chromosome condensation ： ウィキペディア英語版 |
Premature chromosome condensation
Premature chromosome condensation (PCC) occurs in eukaryotic organisms when mitotic cells fuse with interphase cells.〔 Chromatin, a substance that contains genetic material such as DNA, is normally found in a loose bundle inside a cell's nucleus. During the prophase of mitosis, the chromatin in a cell compacts to form condensed chromosomes; this condensation is required in order for the cell to divide properly. While mitotic cells have condensed chromosomes, interphase cells do not. PCC results when an interphase cell fuses with a mitotic cell, causing the interphase cell to produce condensed chromosomes prematurely.
The appearance of a prematurely condensed chromosome depends on the stage that the interphase cell was in.〔 Chromosomes that are condensed during the G1 phase are usually long and have a single strand, while chromosomes condensed during the S phase appear crushed. Condensation during the G2 phase yields long chromosomes with two chromatids.
== References ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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