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GlaxoSmithKline Successfully Completes Tender Offer for Shares of Genelabs Technologies, Inc.

Posted January 7, 2009

GlaxoSmithKline Successfully Completes Tender Offer for Shares of Genelabs Technologies, Inc.

LONDON, Jan. 7 /PRNewswire-FirstCall/ -- GlaxoSmithKline plc (LSE/NYSE:
GSK) announced today the successful completion of the tender offer by its
wholly-owned subsidiary Gemstone Acquisition Corporation for shares of
common stock of Genelabs Technologies, Inc. (Nasdaq: GNLB). The tender
offer expired at 12:00 midnight, 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of Genelabs have tendered and not withdrawn a total of approximately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 percent 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 percent 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.

About GlaxoSmithKline plc

GlaxoSmithKline plc -- one of the world's leading research-based
pharmaceutical and healthcare companies -- is committed to improving the
quality of human life by enabling people to do more, feel better and live
longer. For company information including a copy of this announcement and
details of the company's updated product development pipeline, visit GSK at
http://www.gsk.com.

Enquiries:
UK Media enquiries: Philip Thomson (020) 8047 5502
Alice Hunt (020) 8047 5502
Stephen Rea (020) 8047 5502

US Media enquiries: Nancy Pekarek (919) 483 2839
Mary Anne Rhyne (919) 483 2839
Sarah Alspach (215) 751 7709
Melinda Stubbee (215) 751 7709

European Analyst/Investor enquiries: David Mawdsley (020) 8047 5564
Sally Ferguson (020) 8047 5543
Gary Davies (020) 8047 5503

US Analyst/ Investor enquiries: Tom Curry (215) 751 5419
Jen Hill (215) 751 7002


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