Figure 1. Arrangement of alternative 1st exons in genomic DNA sequences. (A) Schematic showing the arrangement of mouse Sepp1 exons 1a, 1b, and 1c within the genomic DNA sequence. (B) Genomic sequence of alternative 1st exons. Exon 1a is shown in green, exon 1b is shown in red, and exon 1c is shown in blue, with purple showing the overlap region between exon 1b and exon 1c. Triangles indicate transcription start sites according to NCBI. (C) Alignment of mouse, rat and human genomic sequences showing the relative location of the alternative 5′ exons.