Patent ID: 7569362

Claim:
An expression vector comprising, a promoter; a 5′ UTR; a single splice donor; an intron; a first splice acceptor; a first exon encoding a first polypeptide; a second splice acceptor; and a second exon encoding a second polypeptide, wherein the promoter is operably linked to the first and second exon, wherein upon entry into a cell, said single splice donor splices with said first splice acceptor, forming a spliced transcript which permits translation of said first exon, and said second splice acceptor forming a spliced transcript which permits translation of said second exon, wherein said first or second splice acceptor, or both, comprise any one of the sequences selected from the group consisting of SEQ ID NOS: 1-28, and wherein said first polypeptide and said second polypeptide are expressed from said spliced transcripts.