Oruka Therapeutics (ORKA) S-4/A Registration of securities issued in business combination transactions (amended)

Exhibit 99.8

October 28, 2008

Nuvelo, Inc.

201 Industrial Road, Suite 310

San Carlos, CA

Consent to Reference in Proxy Statement/Prospectus/Consent Solicitation

In connection with the Registration Statement on Form S-4 filed by Nuvelo, Inc. on October 28, 2008,I hereby consent to the reference to me in the proxy statement/prospectus/consent solicitation in such registration statement as a future member of the board of directors of Nuvelo.

Sincerely,

/s/ LINDA GRAIS

Name: Linda Grais, M.D.