WASHINGTON :Scientists in recent years have made progress in finding ancient DNA in fossils, gaining insight into organisms that lived long ago. But the oldest DNA obtained so far dates back about two million years. Proteins, a cell's molecular machinery, also offer valuable information and have the virtue of surviving much longer, as new research shows. Scientists have now extracted and sequenced proteins from dental fossils of extinct rhinoceroses, elephants and hippopotamuses, including from

Tag-uri: DNA