Are stem-cell stocks a good buy? By: MarketWatch July 13, 2011 at 15:05 PM EDT After years of being swatted about like ping-pong balls, are stem-cell stocks now a good buy for investors? Read More >> Related Stocks: Athersys Inc Brooklyn Immunotherapeutics Inc Geron Corp Macy's Osiris Therapeutics Pluristem Therapeutc Rti Surgical Inc