--are for antibodies specific to antigens of peripheral nerve; they are not part of the usual anti-nuclear antibody panel (or the variations of the anti-nuclear antibodies that are used to look for vascular/connective tissue disease disorders).

See:

http://www.questdiagnostics.com/test...ripheralNeurop

http://neuromuscular.wustl.edu/nother/autoantibody.html