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Meteorites Rich in Amino Acids2 Apr, 2008 11:44 am The origins of life on Earth have not yet been clearly established. It is thought that the first living systems may have made use of organic materials...Improve Upon Nature: Genetically Encoding Unnatural Amino Acids27 Jul, 2007 09:49 am The building blocks of proteins in nearly all organisms are limited to 20 amino acids. It might be perfect for nature, but not ideal for scientists... |