EXHIBIT 1

AGREEMENT REGARDING JOINT FILING

        The undersigned, Biotechnology Value Fund, L.P., a Delaware limited partnership, Biotechnology Value Fund II, L.P., a Delaware limited partnership, BVF Investments, L.L.C., a Delaware limited liability company, Investment 10, L.L.C., an Illinois limited liability company, BVF Partners L.P., a Delaware limited partnership, and BVF Inc., a Delaware corporation, hereby agree and acknowledge that the information required by Schedule 13D, to which this Agreement is attached as an exhibit, is filed on behalf of each of them. The undersigned further agree that any amendments or supplements thereto shall also be filed on behalf of each of them.

Dated:	January 28, 2005
	BIOTECHNOLOGY VALUE FUND, L.P.
	By:	BVF Partners L.P., its general partner
		By:	BVF Inc., its general partner
			By:	/s/  MARK N. LAMPERT
				Mark N. Lampert President
	BIOTECHNOLOGY VALUE FUND II, L.P.
	By:	BVF Partners L.P., its general partner
		By:	BVF Inc., its general partner
			By:	/s/  MARK N. LAMPERT
				Mark N. Lampert President
	BVF INVESTMENTS, L.L.C.
	By:	BVF Partners L.P., its manager
		By:	BVF Inc., its general partner
		By:	/s/  MARK N. LAMPERT
			Mark N. Lampert President
	INVESTMENT 10, L.L.C.
	By:	BVF Partners L.P., its attorney-in-fact
		By:	BVF Inc., its general partner
			By:	/s/  MARK N. LAMPERT
				Mark N. Lampert President
	BVF PARTNERS L.P.
	By:	BVF Inc., its general partner
		By:	/s/  MARK N. LAMPERT
			Mark N. Lampert President
	BVF INC.
	By:	/s/  MARK N. LAMPERT
		Mark N. Lampert President