The Isoc1-Fbn2 fusion gene (Isoc1(Mp)) mRNA has a frameshift and early stop codon resulting in nonsense mediated decay.     ///    "The Fbn2-Isoc1 fusion gene (Fbn2 (Mp)) predicted protein consists of the N-terminal Fibrillin-2 (amino acids 1-2646, exons 1-62) lacking the C-terminal furin-cleavage site with a short out-of-frame extension encoded by the final exon of Isoc1. "