GlaxoSmithKline plc (GSK) successfully completed the tender offer by its wholly-owned subsidiary Gemstone Acquisition Corporation for shares of common stock of Genelabs Technologies, Inc. The tender offer expired at 12:00midnight, New York City time, on Tuesday, January 6, 2009.

The depositary for the tender offer has advised GSK that shareholders of Genelabs have tendered and not withdrawn a total of approximately 39,250,243 shares of Genelabs common stock. These shares, together with the shares beneficially owned by GSK and its wholly-owned subsidiaries, represent approximately 88.55 per cent of the outstanding shares of Genelabs on a fully diluted basis. Gemstone has accepted for payment all Genelabs shares tendered in the offer.

GSK also announced that Gemstone exercised its 'top-up' option in accordance with the previously announced merger agreement with Genelabs. The exercise of the top-up option allowed Gemstone to increase its share ownership percentage of Genelabs through the purchase of newly-issued shares of Genelabs common stock at the tender offer price. As a result, Gemstone owns more than 90 per cent of the outstanding shares of Genelabs common stock and intends to effect a short-form merger as promptly as practicable, without the need for a meeting of Genelabs shareholders. In the merger, Gemstone will acquire all other Genelabs shares (other than those as to which holders properly exercise dissenters' rights) at the same $1.30 per share price, without interest and less any required withholding taxes, that was paid in the tender offer. As a result of the merger, Genelabs will become a wholly-owned subsidiary of GSK and Genelabs shares will cease to be traded on The NASDAQ Capital Market.