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                                                                    EXHIBIT 23.3

                    CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS

As independent public accountants, we hereby consent to the incorporation by
reference in this registration statement of our report dated February 9, 2001
included in Aronex Pharmaceuticals, Inc.'s Form 10-K for the year ended December
31, 2000, which includes an explanatory paragraph that describes an accounting
change discussed in Note 2 to the financial statements.

/s/  ARTHUR ANDERSEN LLP

Houston, Texas
September 17, 2001