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I'd like to open an account <a href=" http://www.greekwithenvy.com/ativan-auditory-hallucination-side-effects/ ">ativan in breastmilk</a> Amino acids have two orientations, D & L. These two orientations are mirror images of each other. Living organisms generally keep their amino acids in an L configuration, but the amino acids flip to a D formation once the organism dies. Measuring the ratio of D to L amino acids can approximate how long an organism has been dead.