Contact:

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

At the Financial
Relations Board:
Analyst Inquiries:
Leslie Loyet
312.640.6672

or
General Inquiries
Kathy Waller
312.640.6696

RegeneRx Biopharmaceuticals, Inc. (AMEX:RGN) (www.regenerx.com) reported today that Mexico has issued a notice of allowance for the patent application: Thymosin beta 4 (TB4) promotes wound repair. The original patent application filed by the National Institutes of Health and licensed to RegeneRx, claims numerous compositions, uses and processes related to TB4 and wound healing. Similar applications have been filed in other territories throughout the world, including in the U.S. and Asia, several of which have previously been granted. RegeneRx has independently filed over fifty additional world-wide patent applications related to its technology platform.

About RegeneRx Biopharmaceuticals, Inc.
RegeneRx is focused on the discovery and development of novel molecules to accelerate tissue and organ repair. Currently, RegeneRx is developing TB4, a 43-amino acid peptide, in part, under an exclusive world-wide license from the National Institutes of Health. Preliminary research suggests that TB4 may prove efficacious for multiple indications; therefore RegeneRx is developing TB4 as a therapeutic platform. RegeneRx holds over fifty world-wide patents and patent applications related to dermal, ocular, and internal wounds and tissue repair, cardiac and neurological injuries, and septic shock. RegeneRx is currently sponsoring three Phase II chronic dermal wound healing clinical trials and has additionally targeted ophthalmic and cardiac trials in 2006 as part of its ongoing clinical development program.

Thymosin Beta 4
TB4 is a synthetic version of a naturally occurring peptide present in virtually all human cells. It is a first-in-class drug candidate that promotes endothelial cell differentiation, angiogenesis in dermal tissues, keratinocyte migration, collagen deposition, and down-regulates inflammation. One of TB4's key mechanisms of action is its ability to regulate the cell-building protein, actin, a vital component of cell structure and movement. Additionally, TB4 directly influences the production of laminin-5, a protein responsible for proper adhesion and migration of certain types of mammalian cells and often deficient in patients with EB. It has also recently been reported that TB4 can inhibit or prevent apoptosis (programmed cell death) in ocular tissue and cardiac tissue. Researchers at the National Institutes of Health, and at other academic institutions throughout the U.S., have published numerous scientific articles indicating that TB4 is effective in accelerating dermal and corneal wound healing in several animal models, under a variety of conditions. A recent article was published in the scientific journal, Nature, indicating that TB4 protects heart tissue following a myocardial infarction (heart attack) in laboratory animals. Abstracts of scientific papers related to TB4's mechanisms of action may be viewed at RegeneRx's web page: www.regenerx.com.

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 ongoing and prospective development of TB4 and possible future benefits to the Company, its shareholders, and patients. Due to the nature of product development and the regulatory approval process, the forward-looking statements 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.

For more information please visit RegeneRx's web site at www.regenerx.com

SOURCE: RegeneRx Biopharmaceuticals, Inc.

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