HealthKey stem cell patents revoked The US Patent Office revokes fundamental patents on human embryonic stem cells that critics say had stifled stem cell research ¿ìè¶ÌÊÓÆµ
HealthTwo 'ethical' ways to harvest stem cells New techniques might offer a way to get embryonic stem cells without destroying an embryo ¿ìè¶ÌÊÓÆµ