Some single-celled amoebas that become stalled while dividing
into two daughter cells summon help from fellow amoebas, according to a report in March 22 NATURE.
Normally, cells stop dividing
after about the 70th generation,'' he said.
Using a new technique that biochemically labels dividing
T cells, including CD4 cells, the researchers compared the blood of HIV-positive patients who were not yet receiving antiretroviral drugs, HIV-positive patients who had just completed a 12-week course of antiretroviral therapy, and volunteers not infected with HIV.
The first report of a human myocyte caught in the act of dividing
appears in the July 21 Proceedings of the National Academy of Sciences.
Unlike normal chromosomes, double minute chromosomes do not have centromeres, the DNA sequences that a dividing
cell uses to ensure that its progeny receive an equal number of chromosomes.
Those yeast strains have similar trouble segregating chromosomes among dividing
Investigators have unexpectedly found that this drug can induce dividing
cells to commit suicide and can shrink tumors growing in mice.
5 Nature, found a diverse array of embryos caught in the earliest stages of development, as the eggs began dividing
into multiple cells.
Indeed, most cancer cells seem to depend upon telomerase to bypass senescence and continue dividing
The proteins reside in centrosomes, kinetochores, and nuclear membranes--structures involved in the dispersal of chromosomes in dividing
cells--he and his coworkers report in the Sept.
Many chemotherapeutic agents kill cancer cells by blocking their growth However, drugs that kill a rapidly dividing
malignant cell will also destroy rapidly dividing
healthy cells, such as some of those in the intestinal lining, hair follicles, or blood.
Over the years, biologists have developed a detailed picture of how dividing
eukaryotic cells-cells with a nucleus-copy their chromosomes and parcel identical sets to the resulting pair of cells.
Do chromosomes, however, actually direct the drama of the dividing
The modified virus can perform that task even in cells that are not dividing
, such as the neurons in a rat's brain.
cells incorporated BrdU into new DNA, signaling that new cells had been created, says Kolb.