1. Department of Psychology (M.D.T., C.M., K.K.S.), University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
2. Department of Zoology (M.D.T., D.A.C., N.A., K.K.S.), University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
3. Department of Microbiology and Immunology (A.W.P., N.A.), University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
4. Department of Biological Sciences (B.A.S.), Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada
5. Department of Pathology and Laboratory Medicine (J.G.V.D.G., D.T.H.), St. Paul’s Hospital, Vancouver, British Columbia V6Z 1Y6, Canada
6. Department of Fisheries (D.A.C.), University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
7. Department of Brain Research Centre (K.K.S.), University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada