As of 9:15 a.m., the 225-issue Nikkei Stock Average lost 159.81 points, or 0.92 percent, from Friday to 17,271.24.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, dropped 11.80 points, or 0.94 percent, at 1,249.90.
Real estate, electric power and gas, and transportation equipment issues comprised those that declined the most in the opening minutes after the morning bell.
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