May be involved in pre-mRNA splicing. Interacts with the N-terminus of HD. Expressed in the striatum and cortex of the brain (at protein level). Highly expressed in testis, fetal kidney and fetal brain. Moderately expressed in pancreas, skeletal muscle, placenta, brain and heart. Weakly expressed in colon, ileum, ovary, prostate, spleen, kidney and fetal lung. Belongs to the PRPF40 family. Contaminating sequence. Potential poly-A sequence.