Several steps later, the scientists were able to clone the mice. "This is the first time a mammal has been cloned from a sample stored at conditions reasonably close to what might be expected in ...

Three mice from tail-tip cells were born alive, all of them males with black eyes. Due to the very small number of live offspring obtained, however, the relationship between cloning success or ...

we explain how we clone egg cells to create embryonic stem cells in our lab at Children's Hospital Boston. Unless otherwise noted, images show mouse cells.—Kitai Kim & Willy Lensch Drs.