Probably functions as an alternative splicing regulator. May regulate the mRNA splicing of genes such as CLK1. May act by regulating members of the CLK kinase family. Probably interacts with CLK4. Located in nuclear dots. Highly expressed in brain. Expressed at intermediate level in lung and liver. In brain, it is expressed in the hippocampus, cerebellum and olfactory bulb. Phosphorylated in vitro by CLK4. Belongs to the splicing factor SR family. It is uncertain whether Met-1 or Met-16 is the initiator. Truncated N-terminus. Truncated N-terminus.