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Indian stock indices traded in the red for the second straight session, after snapping a six-session winning streak in the previous session. The latest decline could be attributed to profit booking and concerns among investors over high stock valuations. At 11.10 am, Sensex was at 72,239.61 points, down 383.48 points or 0.53 per cent, while Nifty was at 21,933.50 points, down 121.55 points or 0.55 per cent. Among the widely-tracked Nifty 50 stocks, 13 advanced and the rest 37 declined at the time of filing this report.