Why do living organisms use predominantly L amino acids?

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Sami

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Sami asked the Naked Scientists:
   
Why are L-amino acids exclusively used by cells in most of the living world? Is there any research going on regarding this matter and are there any interesting results so far?

What do you think?
« Last Edit: 26/01/2010 19:30:02 by _system »

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Offline RD

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Why do living organisms use predominantly L amino acids?
« Reply #1 on: 27/01/2010 20:11:04 »
Polarised light from stars selectively destroying the R-type is one theory ...
http://www.americanscientist.org/issues/feature/1999/4/polarized-starlight-and-the-handedness-of-life