"Life has been using a standard set of 20 amino acids to build proteins for more than 3 billion years," said Stephen J. Freeland of the NASA Astrobiology Institute at the University of Hawaii. "It's becoming increasingly clear that many other amino acids were plausible candidates, and although there's been speculation and even assumptions about what life was doing, there's been very little in the way of testable hypotheses."
"To the best of our knowledge, the original chemicals chosen by known life do not constitute a unique set; other choices could have been made, and maybe were made if life started elsewhere many times," said Paul Davies -leading authority in astrobiology, director of BEYOND: Center for Fundamental Concepts in Science and co-director of the ASU Cosmology Initiative.
Read More: http://www.dailygalaxy.com/my_weblog/2011/08/is-dna-random-or-a-universal.html
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