EXHIBIT 23.1 ------------ 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 March 22, 1999, included in American Biogenetic Sciences, Inc.'s Form 10-K for the year ended December 31, 1998, and to all references to our firm included in this Registration Statement. /s/ Arthur Andersen LLP Melville, New York December 16, 1999