U.S. stock index futures pointed to a higher open on Wall Street on Wednesday, after a higher-than-expected take up of the European Central Bank's second long-term refinancing operation. European banks bought 529.5 billion euros ($713 billion) of the cheap loans. European stocks rose on Wednesday morning, as investors bet that a second wad of cheap, long-term funds from the European Central Bank would further ease tension in the banking sector and boost confidence in the wider market.
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