How sperm stem cells maintain their numbers

The steady production of sperm relies on the number of sperm stem cells in the testis remaining constant. Researchers including Assistant Professor Yu Kitadate and Professor Shosei Yoshida (developmental biologists at the ...

Spare gene is fodder for fishes' evolution

Scientists have suspected that spare parts in the genome—extra copies of functional genes that arise when genes or whole genomes get duplicated -- might sometimes provide the raw materials for the evolution of new traits. ...

Time (and PPAR-beta/delta) heals all wounds

Mammalian skin requires constant maintenance, but how do skin cells know when to proliferate and at what rate? In the March 23, 2009 issue of the Journal of Cell Biology, Nguan Soon Tan and colleagues reveal that skin fibroblasts ...