Internexin, alpha (NF66)

alpha-internexin is a ~66 kD Class IV intermediate filament originally discovered as it copurifies with other neurofilament subunits. It is related to but distinct from the better known neurofilament triplet proteins, NF-L, NF-M and NF-H, having similar protein sequence motifs and a similar intron organization. It is expressed in large amounts early in neuronal development, but is downregulated in many neurons as development procedes. Many classes of mature neurons contain alpha-internexin in addition to NF-L, NF-M anbd NF-H. In some mature neurons alpha-internexin is the only neurofilament subunit...