SEATTLE--(BUSINESS WIRE)--ZymoGenetics, Inc. (NASDAQ:ZGEN) today announced enrollment has been completed in the Phase 2b clinical trial with PEG-Interferon lambda and ribavirin in chronic hepatitis C virus (HCV) infection. ZymoGenetics is investigating PEG-Interferon lambda in collaboration with Bristol-Myers Squibb Company (NYSE:BMY) for the treatment of HCV infection.