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Origin Of Life
Lead author: Sawsan Wehbi, Genetics Graduate Interdisciplinary Program, University of Arizona, Tucson, AZ.
Amino acids date back four billion years, the last universal common ancestor (LUCA).
Scientists have creaated an evolutionary tree of amino acids, a tree of these protein domains.
Trytophan, designated by the letter "W" was the last of the 20 canonical amino acids to be added to the genetic code, but "W" has now been found to exist pre-LUCA.
Nohting new here: again, suggesting these amino acids emerged around the alkaline hydrothermal vents that are believed to have played a key role in how life began, despite the fact that the resulting life forms did not live there for long.
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