Exhibit 23.1 Consent of Independent Auditors We consent to the reference to our firm under the caption "Experts" and to the use of our report dated April 14, 2000 in the Registration Statement (Form S-1 No. 333- ) and related Prospectus of StemCells, Inc. (formerly CytoTherapeutics, Inc.) for the registration of 3,205,486 shares of its common stock. Providence, Rhode Island September 7, 2000