Subcellular locations: Cytoplasm, Nucleus, Nucleus, Cajal body
Resides in sub-nuclear structures known as SC35 speckles or nuclear splicing speckles.
Isoform 1 is highly expressed in adult and fetal heart, skeletal muscle, and at a much lower levels in adipose tissue and in aorta. Undetectable in other tissues. Isoform 2 and isoform 3 are poorly detected in heart.