NEW YORK ( TheStreet) -- Shares of Sangamo BioSciences (Nasdaq: SGMO) were gapping down Monday morning with an open price 24.1% lower than Friday's closing price. The stock closed at $4.35 Friday and opened today's trading at $3.30. The average volume for Sangamo BioSciences has been 552,000 shares per day over the past 30 days. Sangamo BioSciences has a market cap of $241.8 million and is part of the health care sector and drugs industry. Shares are down 34.5% year to date as of the close of trading on Friday. Sangamo Biosciences, Inc. engages in the research, development, and commercialization of zinc finger DNA-binding proteins (ZFPs) for gene regulation and gene modification in the United States. TheStreet Ratings rates Sangamo BioSciences as a sell. The company's weaknesses can be seen in multiple areas, such as its feeble growth in its earnings per share, deteriorating net income and disappointing return on equity. You can view the full Sangamo BioSciences Ratings Report. Get more investment ideas from our investment research center. Interested in other stocks that are gapping down? Get free SMS text alerts sent to you when the action happens by texting DOWN to 95370 or select from multiple alert options.