A substitution of AGT to GCG in exon 11 results in an alanine for serine substitution at amino acid 302 (S302A), resulting in an unphosphorylated (by cyclin D1/D2-cdk4) isoform. In addition, a neomycin resistance cassette was inserted downstream of exon 11. Translational activity of CELF1 is inhibited. (J:244612)