Consistent with that possibility, the chemokines CCL2, CCL3, and CX3CL1 are all highly expressed after peripheral nerve injury (Ren and Dubner, 2010) with the corresponding chemokine receptors, CCR2, CCR5, and CX3CR1 expressed by NK cells (Loux et al., 2010). Here, CX3CL1 is linked to peripheral nerve injury.