How is all of that DNA packaged so tightly into chromosomes and squeezed into a tiny nucleus? Histones are a family of small, positively charged proteins termed H1, H2A, H2B, H3, and H4 (Van Holde ...

The stages outlined in the following example show a cell with a diploid chromosome number of four (two sets of two chromosomes) undergoing cell division. The replicated chromosomes are not visible ...

Chromatid aberrations in peripheral leukocytes ... Moreover, although it is not known in what stage the chromosomes of reticuloendothelial-tissue stem cells or precursors of peripheral leukocytes ...

Each chromosome is, at this time, actually two identical copies. Each copy is called a chromatid. A spindle begins to form from the centrioles. This spindle is made of fibers. The centrioles begin ...

Science DNA breaks are toxic lesions for the cell. In order to repair these breaks, it is necessary, starting from the break ends, to find a homologous sequence within the vastness of the genome. In ...