AMEX to Trade Options on Osiris Therapeutics, Inc.

NEW YORK, April 4 /PRNewswire/ -- The American Stock Exchange(R) (Amex(R)) will launch trading in options on Thursday, April 5, 2007, on the following Nasdaq Stock Market listed stock of:

* Osiris Therapeutics, Inc.

Osiris Therapeutics, Inc. options will open with strike prices of 17 1/2 - 20 - 22 1/2 and position limits of 5,000,000 shares. The options will trade on the February expiration cycle. The specialist will be Susquehanna Investment Group. Osiris Therapeutics, Inc. researches and develops therapeutic products for the regeneration of human connective tissues.

About the American Stock Exchange

The American Stock Exchange(R) (Amex(R)) offers trading across a full range of equities, options and exchange traded funds (ETFs), including structured products and HOLDRS(SM). In addition to its role as a national equities market, the Amex is the pioneer of the ETF, responsible for bringing the first domestic product to market in 1993. Leading the industry in ETF listings, the Amex lists 281 ETFs to date. The Amex is also one of the largest options exchanges in the U.S., trading options on broad-based and sector indexes as well as domestic and foreign stocks. For more information, please visit http://www.amex.com.

American Stock Exchange

CONTACT: Catherine Chantharaj of American Stock Exchange, +1-212-306-1689,catherine.chantharaj@amex.com

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