The test identifies which drug-resistant strains of HIV are harbored in a patient's bloodstream. Viruses that have evolved resistance to HIV drugs are tagged to appear green, while those that have not are tagged to appear red. Credit: Duke University Medical Center News Office Researchers at Duke University Medical Center have developed a highly sensitive test for identifying which drug-resistant strains of HIV are harbored in a patient's bloodstream.

Scientists have discovered a new source of stems cells and have used them to create muscle, bone, fat, blood vessel, nerve and liver cells in the laboratory. The first report showing the isolation of broad potential stem cells from the amniotic fluid that surrounds developing embryos was published today in Nature Biotechnology.