Development of techniques for diagnosis and prevention of fish disease by the analysis of T cell function in fish immune response

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In this project, we showed a) tissue distribution of T cell subset, and the characteristics of CD4^+helper T cells using monoclonal antibodies in ginbuna, b) killing mechanisms and differentiation and activation of CD8^+ cytotoxic T lymphocyte, c) primary importance of cell-mediated immunity in the defense against cell-associate bacteria, d) establishment of basic tools for the induction of Th1 response in fish, e) identification of immune genes and analysis of immune mechanisms in rainbow trout, flounder and yellowtail which enable the studies on cell-mediated immunity in important fishes in aquaculture.