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What would be the fate of protein made from D-amino acids after ingestion by humans?
There are some natural peptides made of D-amino acids, rather than the L-amino acids normally found in nature. It is now possible to chemically synthesize artificial proteins made of D-amino acids.
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Why are amino acids in biology homochiral?
Why are nearly all amino acids in organisms left-handed (exception is glycine which has no isomer) when abiotic samples typical have an even mix of left- and right-handed molecules?