A shopper has a closer look at tuna heads in front of a fishmonger in Tokyo's Tsukiji fish market Friday, Jan. 25, 2008. Recent reports in the United States about high levels of mercury in tuna served at ubiquitous sushi restaurants in New York have been met with a collective yawn in Japan, the world's undisputed sushi capital. (AP Photo/Katsumi Kasahara)

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