A new study reveals the genetic identity of human immunodeficiency virus (HIV), the version responsible for sexual transmission, in unprecedented detail.

Cancer, nervous system disorders such as Parkinson’s disease, cardiovascular disorders and old age have one thing in common: Both in afflicted tissue and in aging cells, scientists have observed oxidative changes in important biomolecules. These are caused by reactive oxygen molecules, including the notorious “free radicals” that are formed as a by-product of cellular respiration and attack cellular proteins, nucleic and fatty acids.

Small fibroids located just beneath the lining of the uterus (submucosal) are more likely to move to the endometrial cavity after uterine artery embolization (UAE) but usually don’t cause major complications, according to a new study.

Researchers from The University of Texas M. D. Anderson Cancer Center have found a therapy that effectively kills human leukemia cells in mice using natural killer (NK) cells from umbilical cord blood.

Changing the sugars attached to a hormone produced in the pituitary gland increased fertility levels in mice nearly 50 percent, a research group at Washington University School of Medicine in St. Louis has found. The change appears to alter a reproductive "thermostat," unveiling part of an intricate regulatory system that may one day be used to enhance human fertility.