Stocks slipped at Wednesday's opening bell as investors waited for a report on the U.S. services sector for clues on the health of the struggling labor market. The Dow Jones industrial average <.DJI> eased 18 points, or 0.18 percent, to 10,572. The Standard & Poor's 500 Index <.SPX> shed 1 point, or 0.11 percent, to 1,147. The technology-focused Nasdaq Composite Index <.IXIC> fell 3 points, or 0.16 percent, to 2,036. The Institute for Supply Management's non-manufacturing index for February, due at 10 a.m. (1500 GMT), is expected to register 63.0, down from January's reading of 65.7 but still indicating solid growth in the economy's services sector. A reading above 50 points to expansion. The employment component of the index will be closely watched ahead of Friday's report from the Labor Department on U.S. payrolls in February. The U.S. economy has been gathering speed, but the labor market has remained stubbornly weak.//www.reutres.com