Immunostaining for the kisspeptin receptor, GPR54, in the mouse skin of GPR54 WT and KO mice. Representative immunostaining showing the specificity of the GPR54 antibody in the peripheral nerve endings of the mouse skin of GPR54+/+ mice (left panel). No immunostaining is observed in GPR54-/- mice (right panel). Scale bar 100 μm. The insert shows an immunopositive fiber at higher magnification (scale bar = 20 μm).