As of 9:15 a.m., the 225-issue Nikkei Stock Average gained 51.78 points, or 0.22 percent, from Friday to 23,868.41.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, added 1.10 points, or 0.06 percent, at 1,734.17.
Pharmaceutical, service and retail-oriented issues comprised those that gained the most in the opening minutes after the morning bell.
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