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Left: THAA vs. FAA d/l Ala for bleached Bithynia shells and opercula from Funthams Lane and Purfleet. Each of the measurements is from a single shell or operculum. Note the variation in relative rates between the two biominerals and the much greater consistency in the measurements obtained from opercula. The outlying shell sample has an amino acid concentration two times that of the other shells, indicating the importance of adequate bleaching (Penkman et al., 2007).
