Shares of public sector undertakings (PSUs) banks were in focus as Nifty PSU Bank index bounced back 11 per cent in the past three trading days, after it saw a sharp decline last week. The Nifty PSU Bank index has tanked 15 per cent in seven days, amid heavy sell-off. In comparison, the Nifty 50 index slipped 4.6 per cent, during the same period.