U.S. Stocks Close Slightly up After Prior Week's Selloff
U.S. Treasury yields slip after rally$Seagen(SGEN)$ surges on Pfizer-buyout reportUnion Pacific jumps as CEO to step downDow up 0.22%, S&P 500 up 0.31%, Nasdaq up 0.63%NEW YORK, Feb 27 (Reuters) - U.S