Per Scotttrade---Advanced Cell Technology Inc vs. Peers Company Market Cap YTD Price Performance ACTC Advanced Cell Technology Inc 12.3M +263.6% GERN Geron Corporation 355.5M -3.8% GENZ Genzyme Corporation 16.5B -8.2% STEM StemCells, Inc. 148.1M +14.7% ASTM Aastrom Biosciences, Inc. 53.7M