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Shares in drugmaker Ranbaxy rose over 2 percent in early trade after it announced a consent decree with the US Food and Drug Administration.
At 9:16 a.m. (0348 GMT), the 30-share BSE index was up 1.75 percent at 15,400.68 points, with all of its components rising.
The broader 50-share NSE index was up 1.72 percent at 4,622.45 points.