<PAGE>
Exhibit 23.1
CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS
We consent to the references to our Firm under the caption "Experts" and to the
use of our report dated February 4, 2000, in the Registration Statement (Form
S-1) and related Prospectus of Xenogen Corporation for the registration of
shares of its common stock.
/s/ Ernst & Young LLP
Palo Alto, California
September 28, 2000
We consent to the references of our Firm under the caption "Experts" in the
Registration Statement (Form S-1) and related prospectus of Xenogen Corporation
and to the use of our report dated September 15, 2000 on the financial
statements of Chrysalis DNX Transgenic Sciences Corporation, included in the
Registration Statement (Form S-1) and the related prospectus of Xenogen
Corporation for the registration of shares of its common stock.
/s/ Ernst & Young LLP
MetroPark, New Jersey
September 28, 2000
--------------------------------------------------------------------------------
