EXHIBIT 24.1 CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS As independent public accountants, we hereby consent to the incorporation by reference in this Registration State- ment 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 May 13, 1996