In contrast,Advanced Cell Technology in Worcester,Mass. ,which last November reported having cloned human embryos(for therapeutic,not reproductive,purposes),reached only six cells.

• 相比之下，马萨诸塞州伍斯特高级细胞技术研究所去年11月份克隆的用于治疗而非生殖目的的胚胎才达到6个细胞。