Exhibit 23.1
Consent of Ernst & Young LLP, Independent Auditors
We consent to the reference to our firm under the caption “Experts” and to the use of our report dated January 23, 2004 (except for the first paragraph of Note 13, as to which the date is March 4, 2004), in Amendment No. 4 to the Registration Statement (Form S-1 No. 333-109653) and related Prospectus of Xcyte Therapies, Inc. for the registration of 4,600,000 shares of its common stock.
/S/ ERNST & YOUNG LLP
Seattle, Washington
March 8, 2004