title: Conservation of optical purity of amino acids: a principal problem in biochemical and proto-biochemical systems.
mesh_terms: D000596:Amino Acids; D001224:Aspartic Acid; D005075:Biological Evolution; D003804:Dentin / Q000032:analysis; D005580:Fossils; D006801:Humans; D007536:Isomerism; D008433:Mathematics; D009904:Optical Rotation
chemical_list: D000596:Amino Acids; D001224:Aspartic Acid