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Pelophylax frogs

James France1, Rebecca Barten1, Neseren Morcy1

  • 1Institute of Biology Leiden, Leiden University, 2300 RA Leiden, The Netherlands; Naturalis Biodiversity Center, 2300 RA Leiden, The Netherlands.

Current Biology : CB
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Lampbrush Chromosomes01:51

Lampbrush Chromosomes

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 resemble the...