Quick Guide: Cloning
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Introduction

Embryo cloning

Reproductive cloning

Therapeutic cloning

Benefits

Concerns

Concerns
The mechanisms of the cloning process are still not fully understood

For opponents any rewards cloning may offer are overshadowed by moral unease and fears scientists are "playing God".

Cloning for stem cells destroys the pre-embryos used, while reproductive cloning risks the lives of both mother and clone, with most attempts failing.

Critics also say clones may suffer untold physical and mental problems.

Many experts believe the debate for and against cloning will be the battle that will define biotechnological practices throughout the 21st Century.

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