"It is common for some arsenic to be found in seafood. However, <a href=""http://www.atsdr.cdc.gov/csem/csem.asp?csem=1&po=5"" target=""_blank"">higher concentrations of dietary organic arsenic</a> may be found in bivalve mollusks (clams, oysters, mussels) and crustaceans (crabs and lobsters), according to the Agency for Toxic Substances and Disease Registry. The organic forms of arsenic found in these types of seafood are generally considered nontoxic."
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