SRSF3 and SRSF4 CLIP-tags cluster to distinct positions in mouse RNAs. (a) NPM1 gene (green box) and the surrounding approximately 3 MB region in chromosome 11 (black box) with SRSF3 and SRSF4 CLIP-tags and clusters. The numbers on the left represent the number of CLIP-tags within the window. The sense strand is marked in blue and the antisense strand in orange. Note that the genes in the antisense strand run from right to left. (b) Comparison of annotated genes with significant SRSF3 or SRSF4 crosslink sites (false discovery rate < 0.05). (c) Comparison of significant SRSF3 and SRSF4 CLIP-tag clusters (overlap of clusters ≥ 15 nucleotides).