![]() Francis Crick (who with James Watson determined the structure of DNA) labeled this set of amino acids the magic 20. ![]() There are more than 300 known natural amino acids however, only 20 of them are used in protein synthesis. ![]() The biologically important amino acids are the alph-amino acids that have the amine and acid groups attached to the same carbon atom. Amino acids are relatively simple molecules containing both an amine group and an acid group.
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