The 225-issue Nikkei Stock Average added 97.97 points, or 0.44 percent, from Thursday to 22,142.42.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, gained 5.16 points, or 0.32 percent, to 1,620.82.
Precision instrument, pharmaceutical and real estate-linked issues comprised those that gained the most by the morning break.
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