RegeneRx


Contact:

At RegeneRx:
J.J. Finkelstein
jjfnk@regenerx.com
301.280.1992

or

At the Financial
Relations Board:

Analyst Inquiries:
Leslie Loyet
312.640.6672

or
General Inquiries
Kathy Waller
312.640.6696

or
Media Inquiries
Tim Grace
312.640.6741

RegeneRx Rings the AMEX Opening Bell

RegeneRx Rings the AMEX Opening Bell

April 8, 2005 — Bethesda, Md

RegeneRx Biopharmaceuticals, Inc. (AMEX: RGN) (www.regenerx.com) rang the opening bell of the American Stock Exchange (AMEX) on Thursday, April 7. On hand for the ceremony were J.J. Finkelstein, president and chief executive officer, and Allan Goldstein, Ph.D., chairman, as well as other company executives, board members and distinguished guests. The ceremony can be viewed by visiting the AMEX site at www.amex.com.

"We are excited about the move to the AMEX and were very impressed with the hospitality and attention to detail regarding our company and listing. In addition to maintaining a more orderly market with better trading execution, we believe the move will enhance visibility and increase institutional interest as we build our biopharmaceutical business," stated J.J. Finkelstein.

About RegeneRx Biopharmaceuticals, Inc.
RegeneRx is a biopharmaceutical company developing Tß4 as a platform technology for the treatment of acute and chronic wounds and for a variety of human diseases involving tissue and organ repair under an exclusive world-wide license from the National Institutes of Health. The company holds over fifty world-wide patents and patent applications related to dermal, ocular, and internal wounds and tissue repair, including the treatment and prevention of cardiac and neurological injuries. RegeneRx previously received clearance from the U.S. FDA for its first three Phase II dermal wound healing clinical trials.

American Stock Exchange
The AMEX is the only primary exchange that offers trading across a full range of equities, options and exchange traded funds (ETFs), including structured products and HOLDRSSM. 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 145 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.

Safe Harbor Statement
The information in this press release may include certain forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. These statements concern the Company's current expectations regarding future events, including the regulatory approval process and the ongoing and prospective development and commercialization of Tß4 and possible future benefits to the Company, its stockholders, and patients. Due to the nature of clinical trials, product development and the regulatory approval process, the forward-looking statements contained in this press release are subject to risks and uncertainties, including those reflected in the Company's filings with the Securities and Exchange Commission, particularly its most recent Annual Report on Form 10-KSB. The Company assumes no obligation to update or revise any forward-looking statements made herein or any other forward-looking statements made by the Company.

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