May play a key role in signal transduction and growth control. May have a role in the establishment of the intersegmental and segmental nerves. H2O + O-phospho-L-tyrosyl-[protein] = L-tyrosyl-[protein] + phosphate Selectively expressed in a subset of axons and pioneer neurons (including aCC and RP2) in the embryo. Start of expression coincides with the onset of axonogenesis. Belongs to the protein-tyrosine phosphatase family. Receptor class subfamily.