
Endoreplication (also referred to as endoreduplication or polytenization) is replication of the nuclear genome in the absence of cell division, which leads to elevated nuclear gene content and polyploidy. Endoreplication can be understood simply as a variant form of the mitotic cell cycle (G1-S-G2-M) in which mitosis is aborted prior to cytokinesi...
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http://en.wikipedia.org/wiki/Endoreduplication

A form of polyploidy or polysomy by redoubling of chromosomes, giving rise to four-stranded chromosomes at prophase and metaphase. ... (05 Mar 2000) ...
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http://www.encyclo.co.uk/local/20973

(en″do-re-doo″plĭ-ka´shәn) replication of chromosomes without subsequent cell division.
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http://www.encyclo.co.uk/local/21001

Type: Term Pronunciation: en′dō-rē-dū′pli-kā′shŭn Definitions: 1. A form of polyploidy or polysomy by redoubling of chromosomes, giving rise to four-stranded chromosomes at prophase and metaphase.
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http://www.medilexicon.com/medicaldictionary.php?t=29172
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