** European banking sector best performers inEurope, up 3.3 pct, a day after the European Central Bank cutrates
** ECB also said it would expand its asset buying program to80 bln euro per month from 60 bln euro per month
** Shares rose on Thursday after ECB announced cuts, butreversed course after President Mario Draghi said more rate cutswere unlikely
** Banks at the top of the Stoxx 600: Banco Popular +7 pct, Unicredit and Intesa Sanpaolo +6 pct
** Santander, BNP Paribas, ING biggest lifts to banking index
** Barclays, Royal Bank of Scotland,Standard Chartered up 3-3.7 pct, near the top of theFTSE 100
** Stoxx 600 Banks trading above its 50-day SMA, firstbreached on Thursday (venkateshasoumithri.mamidipudi.thomsonreuters.com@reuters.net)