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Sequences of the boundary regions of CD28 gene‐related fusions. Sequences of reverse transcription polymerase chain reaction (RT‐PCR) products of (A) inducible T‐cell co‐stimulator (ICOS) (ex1)–CD28 (ex2), and (B) cytotoxic T‐lymphocyte‐associated antigen 4 (CTLA4) (ex3)–CD28 (ex4). [Colour figure can be viewed at wileyonlinelibrary.com]
