A research group has discovered that high concentrations of D-amino acids, in addition to L-amino acids, are present in the body tissues of polychaetes and that their composition is species-specific. A research group has discovered that high concentrations of D-amino acids, in addition to L-amino acids, are present in the body tissues of polychaetes and that their composition is species-specific. Plants & Animals Ecology Phys.org – latest science and technology news stories