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パレオゾイク時代の非アモコエトの幼虫

Tetsuto Miyashita1,2,3,4, Robert W Gess5, Kristen Tietjen6,7

  • 1Department of Organismal Biology and Anatomy, University of Chicago, Chicago, IL, USA. TMiyashita@nature.ca.

Nature
|March 11, 2021
PubMed
まとめ

化石のラプリー幼虫は アムモコエテス (フィルター餌食の幼虫) が 原始的な脊椎動物の祖先を表すという考えに異議を唱える. この古代の幼虫は 成人型の特徴を持ち 暗示するところは アムノコエテスは現代のランプレイの 特殊な特徴だということです

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Lampbrush Chromosomes01:51

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In 1882, Flemming observed lampbrush chromosomes (LBC) in salamander eggs. Later in 1892, Rückert observed LBCs in shark egg cells and coined the term "lampbrush chromosomes" because they looked like brushes used to clean kerosene lamps.
LBCs are made up of two pairs of conjugating homologous chromatids. Each chromatid consists of alternatively positioned regions of condensed-inactive chromatin and loosely placed-active side loops, which can be contracted and extended. The loops...
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