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Natural variations of metallothionein (MT) concentrations in the Asiatic clam Corbicula fluminea were analyzed over a 1-year period in specimens collected from an unpolluted site (Cazaux-Sanguinet lake, southwest France). Sampling was carried out from November 1994 to December 1995, one to three times per month, according to the season. At each sampling time, lake temperature was measured and concentrations...
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