Study Suggests Way To Create New Eggs In Women  Pregnant woman's
belly i i Alvaro Heinzen/iStockphoto Pregnant woman's belly
Alvaro Heinzen/iStockphoto   "The traditional belief in the
field has been that when a baby girl is born, she is given a
bank account of eggs, and that bank cannot be added to, only
withdrawn from," said Jonathan Tilly, a researcher at
Massachusetts General Hospital and Harvard Medical School in
Boston.  In 2004, Tilly shocked the scientific world when he
claimed he had found primitive "stem" cells hiding in the
ovaries of adult female mice that could generate new eggs. That
raised the possibility that it might be true for women as well.
"The implications at the time were enormous," Tilly said.  But
that claim was challenged by other scientists. And Tilly had
only found the cells in mice. No one knew whether humans had
them, too.  In a series of experiments being published in the
March issue of the journal Nature Medicine, Tilly and his
colleagues say they have proved young adult women