EXHIBIT 24.1 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 14, 1996 included in XOMA Corporation's Form 10-K for the year ended December 31, 1995, and to all references to our Firm included in this Registration Statement. ARTHUR ANDERSEN LLP San Francisco, California April 10, 1996