Some kinase genes containing extra exons. (a) FGFR1 gene. (b) CDKL2 gene. (c) VRK1 gene. Putative new exons derived from CST analysis are reported are marked by a dot. Splicing patterns are indicated by continuous (known) and dashed (predicted) lines. Exons encoding kinase, transmembrane and Ig-like domains are indicated; white boxes represent untranslated RNA sequence, a star marks the leader peptide of FGFR1.