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. 2008 Feb;3(1-2):2–25. doi: 10.1016/j.quageo.2007.07.001

Fig. 22.

Fig. 22

FAA to THAA D/L correlation for each amino acid for bleached and unbleached Valvata (left) and Corbicula (right). There is no improvement upon bleaching for Corbicula, unlike that observed for the fossil gastropods.