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 | | Frank Lane Picture Agency/CORBIS |
Scientists are getting better at all kinds of cloning, but the public and Congress are struggling to keep up. Here's a guide to the techniques and where they stand in terms of political acceptability.
THE SCIENCE: Certain primitive cells found in the brain, blood and elsewhere in the body remain undeveloped enough even in adults that they can grow into a limited number of cell types. (Neurons are pictured above.) These cells might be coaxed to become a wider variety of tissues.
THE ETHICS: An acceptable avenue of research to most people but the least practical option scientifically because adult stem cells may not prove as versatile as embryonic ones. |
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