transcript switiching. (A) Splice isoforms of Skap1 annotated in the GRCm38v70 genome. The ‘functional’ isoforms encode a protein with a PH domain annotated in Pfam; isoforms 001 and 009 also contain an SH3 domain. Exons contributing to the domains are indicated in green (PH) and red (SH3). The truncated isoforms lack both PH and SH3 domains. Non-coding isoforms do not encode a protein. (B) Expression levels of Skap1 in the CD4+ subtypes. (C) Relative expression of Skap1 functional, truncated and non-coding isoforms for each CD4+ subtype. PSI values were summed for all full-length, truncated or non-coding isoforms.