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CD2 is expressed on the surfaces of virtually all T cells and natural killer (NK) cells. In mammals, the CD2 molecule is 50 kDa. The cytoplasmic tail of CD2 interacts with CD2-associated protein (CD2AP), which plays an important role in mediating the trigger signal in outer magnetic pole cells. In this study, we identified CD2AP from rock bream and investigated its gene expression. The ORF of CD2AP (1950 bp) encodes 650 amino acids (aa). CD2AP has a Src homology 3 (SH3) domain. Quantitative real-time PCR analysis revealed that CD2AP shows higher expression in the gills and skin. Under experimental challenge, CD2AP gene expression was increased as relative to the control after 7 days. This result will improve our understanding of blood vessels in teleost fish, and will provide a basis for the study of CD2-related genes.We identified the CD2AP from leucocytes of rock bream.CD2AP has a Src homology 3 (SH3) domain that interact with CD2.CD2AP is expressed late in during pathogen infection.