ÎçÒ¹¸£Àû1000¼¯ºÏKey stem cell patents revoked The US Patent Office revokes fundamental patents on human embryonic stem cells that critics say had stifled stem cell research News
ÎçÒ¹¸£Àû1000¼¯ºÏTwo 'ethical' ways to harvest stem cells New techniques might offer a way to get embryonic stem cells without destroying an embryo News