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The Bcl-xγ cytosolic protein is essential for costimulatory activity after CD3/CD28 coligation. Here we delineate the Bcl-xγ/Bcl-x genomic organization and the molecular mechanism that allows expression. We show that exon 4 of the Bcl-x gene encodes the unique C-terminal end of the Bcl-xγ molecule while exons 5, 6, 7 and 8 are differentially transcribed to yield three alternative Bcl-xγ 3' untranslated...