Cantab Pharmaceuticals plc may get a freebie courtesy of the U.S. Federal Trade Commission, which is looking at the merger of Glaxo Wellcome plc with SmithKline Beecham plc. According to Cantab (LSE:CTB; CNTBY, Cambridge, U.K.), the FTC is considering asking Glaxo to return global rights to CTB's DISC-HSV herpes vaccine for prophylactic use because SmithKline (LSE:SB; SBH, London