Fig. 2

Ribo-seq data (HeLa cells) provide evidence for the translational activities of putative coding Alu exons. a Comparison of Alu exon inclusion levels in Ribo-seq and RNA-seq data of HeLa cells. Each dot represents an Alu exon. Seventy-six putative coding Alu exons with at least 10 reads mapped to one of the three splice junctions in both Ribo-seq and RNA-seq data are shown in the plot. Exons with PRIDE peptide sequences are indicated in red. b-e The UCSC genome browser view of the Ribo-seq and RNA-seq data of four representative Alu exons. The upstream junction read count (UJC), downstream junction read count (DJC), and skipping junction read count (SJC) are also indicated. The stop codon of each mRNA isoform is indicated by a STOP sign