未来50年 克隆人类或成现实
<p>获得今年诺贝尔医学奖的英国科学家约翰•格登爵士表示，未来50年内，那些在意外中失去孩子的父母将有可能通过克隆技术得到孩子的“复制品”。格登爵士指出，虽然克隆人类可能会引发一系列复杂的道德争议，不过一旦该技术在医学领域广施拳脚，人们的担忧就会慢慢消失。他举例指出，试管婴儿技术在最初研发时也广受质疑，但1978年第一个试管婴儿出生以后就被人们广泛接受了。不过，他也表示，克隆技术用于人类之前还需要有大量改进，因为目前大部分克隆的动物胚胎都还是畸形。</p><p><span word="Parents">Parents</span> <span word="who">who</span> <span word="lose">lose</span> <span word="children">children</span> <span word="in">in</span> <span word="accidents">accidents</span> <span word="may">may</span> <span word="be">be</span> <span word="able">able</span> <span word="to">to</span> <span word="clone">clone</span> "<span word="copies">copies</span>" <span word="to">to</span> <span word="replace">replace</span> <span word="them">them</span> <span word="within">within</span> 50 <span word="years">years</span>, <span word="a">a</span> <span word="British">British</span> <span word="scientist">scientist</span> <span word="who">who</span> <span word="won">won</span> <span word="this">this</span> <span word="year">year</span>'<span word="s">s</span> <span word="Nobel">Nobel</span> <span word="prize">prize</span> <span word="for">for</span> <span word="medicine">medicine</span> <span word="has">has</span> <span word="predicted">predicted</span>.</p><p><span word="Sir">Sir</span> <span word="John">John</span> <span word="Gurdon">Gurdon</span>, <span word="whose">whose</span> <span word="work">work</span> <span word="cloning">cloning</span> <span word="frogs">frogs</span> <span word="in">in</span> <span word="the">the</span> 1950<span word="s">s</span> <span word="and">and</span> 60<span word="s">s</span> <span word="led">led</span> <span word="to">to</span> <span word="the">the</span> <span word="later">later</span> <span word="creation">creation</span> <span word="of">of</span> <span word="Dolly">Dolly</span> <span word="the">the</span> <span word="sheep">sheep</span> <span word="by">by</span> <span word="Edinburgh">Edinburgh</span> <span word="scientists">scientists</span> <span word="in">in</span> 1996, <span word="said">said</span> <span word="that">that</span> <span word="progression">progression</span> <span word="to">to</span> <span word="human">human</span> <span word="cloning">cloning</span> <span word="could">could</span> <span word="happen">happen</span> <span word="within">within</span> <span word="half">half</span> <span word="a">a</span> <span word="century">century</span>.</p><p><span word="Although">Although</span> <span word="any">any</span> <span word="attempt">attempt</span> <span word="to">to</span> <span word="clone">clone</span> <span word="an">an</span> <span word="entire">entire</span> <span word="human">human</span> <span word="would">would</span> <span word="raise">raise</span> <span word="a">a</span> <span word="host">host</span> <span word="of">of</span> <span word="complex">complex</span> <span word="ethical">ethical</span> <span word="issues">issues</span>, <span word="the">the</span> <span word="biologist">biologist</span> <span word="claimed">claimed</span> <span word="people">people</span> <span word="would">would</span> <span word="soon">soon</span> <span word="overcome">overcome</span> <span word="their">their</span> <span word="concerns">concerns</span> <span word="if">if</span> <span word="the">the</span> <span word="technique">technique</span> <span word="became">became</span> <span word="medically">medically</span> <span word="useful">useful</span>.</p><p><span word="In">In</span>-<span word="vitro">vitro</span> <span word="fertilization">fertilization</span> <span word="was">was</span> <span word="regarded">regarded</span> <span word="with">with</span> <span word="extreme">extreme</span> <span word="suspicion">suspicion</span> <span word="when">when</span> <span word="it">it</span> <span word="was">was</span> <span word="first">first</span> <span word="developed">developed</span> <span word="but">but</span> <span word="became">became</span> <span word="widely">widely</span> <span word="accepted">accepted</span> <span word="after">after</span> <span word="the">the</span> <span word="birth">birth</span> <span word="of">of</span> <span word="Louise">Louise</span> <span word="Brown">Brown</span>, <span word="the">the</span> <span word="first">first</span> "<span word="test">test</span> <span word="tube">tube</span> <span word="baby">baby</span>", <span word="in">in</span> 1978, <span word="he">he</span> <span word="explained">explained</span>.</p>
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