Receptor for persephin (PSPN), a growth factor that exhibits neurotrophic activity on mesencephalic dopaminergic and motor neurons (PubMed:11116144). Acts by binding to its coreceptor, GFRA4, leading to autophosphorylation and activation of the RET receptor (PubMed:11116144). May be important in C-cell development and, in the postnatal development of the adrenal medulla (PubMed:11116144). . This is the function of GFRA4 (GDNF family receptor alpha 4, Ensembl gene identifier ENSG00000125861).