July 28 (Bloomberg) -- Amgen Inc., the world's largest biotechnology company, had its stock recommendation raised at Morgan Stanley, Jefferies & Co. and Thomas Weisel Partners Group Inc. Included are analysts' calls for Lehman Brothers Holdings Inc., Kimberly-Clark Corp., Teledyne Technologies Inc., Rowan Cos., Aflac Inc., Coventry Health Care Inc., Best Buy Co., Aventine Renewable Energy Holdings Inc. and Goodrich Petroleum Corp.

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