In accordance with Marketplace Rule 4450(e)(4), The Nasdaq’s staff provided GTC until July 31, 2008 to regain compliance. If at any time before July 31, 2008, the aggregate market value of GTCB common stock is $50 million or more for at least ten consecutive trading days, Nasdaq’s staff will determine if GTC complies with the Nasdaq Global Market continued listing standards.

If compliance can not be demonstrated by July 31, 2008, GTC may either appeal the staff’s determination to a Listing Qualification Panel or apply for transfer to the Nasdaq Capital Market. An actual transfer to the Nasdaq Capital Market will be based on the Nasdaq staff’s review of GTC’s application.

GTC Biotherapeutics develops, supplies, and commercializes therapeutic proteins produced through transgenic animal technology. ATryn®, GTC’s recombinant human antithrombin, has been approved for use in Europe and has begun the review process in the United States under a rolling Biologics License Application. In addition to ATryn®, GTC is developing a portfolio of recombinant human plasma proteins with known therapeutic properties. These proteins include recombinant forms of human coagulation factors VIIa, VIII, and IX, which are used for the treatment of hemophilia, and alpha-1 antitrypsin. GTC also has a monoclonal antibody portfolio that includes a monoclonal antibody to CD20 and a monoclonal antibody to CD137. GTC’s intellectual property includes a patent in the United States through 2021 for the production of any therapeutic protein in the milk of any transgenic mammal. GTC’s transgenic production platform is particularly well suited to enabling cost effective development of proteins that are difficult to express in traditional recombinant production systems as well as proteins that are required in large volumes. Additional information is available on the GTC web site, http://www.gtc-bio.com.

This press release contains forward-looking statements as defined in the Private Securities Litigation Reform Act of 1995, including without limitation statements regarding the timing of determinations by Nasdaq. Such forward-looking statements are subject to a number of risks, uncertainties and other factors that could cause actual results to differ materially from future results expressed or implied by such statements. Factors that may cause such differences include, but are not limited to, the risks and uncertainties discussed in GTC's most recent Annual Report on Form 10-K and its other periodic reports filed with the Securities and Exchange Commission, including the risks and uncertainties associated with dependence upon the actions of Nasdaq and other regulatory agencies. GTC cautions investors not to place undue reliance on the forward-looking statements contained in this release. These statements speak only as of the date of this document, and GTC undertakes no obligation to update or revise the statements, except as may be required by law.