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PRESS RELEASE
November 27, 2007

Unidym's Dr. Paul Drzaic Speaking at Materials Research Society Fall Meeting

Menlo Park, Calif.– November 27, 2007 – Unidym, Inc, a majority-owned subsidiary of Arrowhead Research Corporation (NASDAQ: ARWR), announced that Unidym’s Chief Technology Officer, Dr. Paul Drzaic, will be presenting an invited lecture today at the Materials Research Society in Boston, MA. Dr. Drzaic’s presentation, entitled “Carbon Nanotube Network, a New Electronic Material” will provide a perspective on some exciting opportunities in large area and flexible electronic devices enabled by carbon nanotube technology.

Dr. Drzaic will discuss recent development work performed within Unidym, as well as research performed by Unidym founder Professor George Gruner at UCLA, in the area of printable carbon nanotube electronics. Current and potential applications of carbon nanotube electronics, including touch panels, displays, and photovoltaics, will also be noted. This invited lecture will be held in the MRS Symposium on “Large-Area Processing and Patterning for Active Optical and Electronic Devices,” which will cover state of the art development in large area and flexible electronics from around the world.

About Unidym, Inc.

Unidym (www.unidym.com) is a leader in the manufacture and application of carbon nanotubes (CNTs), a novel material with extraordinary electrical, thermal, and mechanical properties. Unidym provides bulk materials, CNT-enabled products, and intellectual property to a wide range of customers and business partners. As a result of its recent merger with CNI, Unidym possesses a foundational patent portfolio that covers nearly every aspect of CNT manufacturing and processing as well as multiple product applications.

Unidym is focused on the electronics industry where its initial products include transparent electrodes for touch screens, flat panel displays, solar cells, and solid state lighting; electrodes for fuel cells; and thin film transistors for printable electronics. Unidym is also pursuing a cross-industry partnership strategy to capture value from the wide ranging uses of CNTs. Unidym’s licensing program, technical expertise and manufacturing facilities can enable partners to rapidly develop CNT solutions for their specific applications.

Unidym is a majority-owned subsidiary of Arrowhead Research Corporation (NASDAQ: ARWR) For more information about Arrowhead, please visit www.arrowheadresearch.com.

Safe Harbor Statement under the Private Securities Litigation Reform Act of 1995:

This news release contains forward-looking statements within the meaning of the "safe harbor" provisions of the Private Securities Litigation Reform Act of 1995. These statements are based upon our current expectations and speak only as of the date hereof. Our actual results may differ materially and adversely from those expressed in any forward-looking statements as a result of various factors and uncertainties, including the recent economic slowdown affecting technology companies, the future success of our scientific studies, our ability to successfully develop products, rapid technological change in our markets, changes in demand for our future products, legislative, regulatory and competitive developments and general economic conditions. Our Annual Report on Form 10-K and 10-K/A, recent and forthcoming Quarterly Reports on Form 10-Q and 10-Q/A, recent Current Reports on Forms 8-K and 8-K/A, our Registration Statement on Form S-3, and other SEC filings discuss some of the important risk factors that may affect our business, results of operations and financial condition. We undertake no obligation to revise or update publicly any forward-looking statements for any reason.

Contacts

Virginia Dadey; Vice President, Investor Relations
Telephone: 212.541.3707
Email: vdadey@arrowres.com

Robert Bismuth, Vice President, Business Development & Marketing
Telephone: 650.462.1935
Email: pr@unidym.com