20年前全球第一个试管婴儿出世。过去一年内科学家先后利用动物卵巢细胞团的细胞核成功地克隆了羊、牛和老鼠。第一个克隆人什么时候会出现？美国普林斯顿大学的分子生物学专家斯尔佛相信，5年内世界会出现第一个克隆人。斯尔佛接受德国《明镜》周刊访问谈克隆人和改善遗传基因 20 years ago the world’s first test-tube baby was born. In the past year scientists have succeeded in cloning sheep, cattle and mice using the nuclei of animal ovarian cell clusters. When will the first clone appear? Sperfer, a molecular biologist at Princeton University in the United States, believes the world will see the first cloned person in five years. Sulfur received a visit from Germany’s Der Spiegel to talk about cloning and genetic improvement