Press Release May 23, 2005

Zelos Therapeutics Inc. Completes Series B Financing

BOSTON, May 23, 2005 – Zelos Therapeutics Inc., an early-stage therapeutics product development company, recently completed its $42.5 million Series B Preferred Stock financing.

The partner from Goodwin Procter who represented Zelos Therapeutics Inc. in this matter is Mitchell Bloom.