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Prelamin A, is processed in the nucleus to lamin A by removal of its final 18 amino acids, including the cysteine residue in its C-terminal CAAX box, which is farnesylated. Nuclear prelamin A recognition factor (NARF) binds the farnesylated prelamin A C-terminal domain(preAct)(PMID:10514485). NARF, at 52 kDa, also named as IOP2, is a small enough protein to freely diffuse through the nuclear pore complex and may be retained within the nucleus by binding nuclear proteins and it has all of the information necessary to be imported into the nucleus(PMID:10514485). It has 3 isoforms produced by alternative splicing with the molecular mass of 51 kDa, 56 kDa and 46 kDa,respectively.