A. Box plot showing the distribution of fold enrichment values per genes sorted by exon number, n= 66, 247, 389, and 574 genes with 1, 2, 3, and 4 exons, respectively. Dashed line represents an IP/Input ratio of 1, taken as a reference. B. Reads from input and IP counted in unstimulated and PMA stimulated triplicates give significant enrichment values of 1.4 and 0.7 on introns and exons, respectively, shown as mean and s.d., n=3 biological replicates. Dots represent individual data points. C. Box plot of reads belonging to spliced transcripts versus all reads in input or RNAchIP samples pooled between + and -PMA, calculated as a ratio between split reads and total reads, n=3 biological replicates. Dots represent individual data points. Data information: All box boundaries represent 25th and 75th percentiles; center line represents median; whiskers indicate ±1.5×IQR; points are values of outliers. All P-values are * P < 0.01, ** P < 0.005, ***P < 0.001; two-tailed Student's t-test. 