The phylogeny and evolution of immune systems. Examines the various strategies for disease resistance used by all organisms from plants to humans. The use and evolution of specific components of innate and adaptive immunity will be considered within the context of the biology of the organisms. This course involves both lectures and graded discussions. Prerequisites: IMIN 371. Credit cannot be obtained for both IMIN 401 and IMIN 501. (Offered jointly by the Departments of Biological Sciences and Medical Microbiology and Immunology). [Biological Sciences].