EGFR and Parkinson disease: While psoriasis has been studied as a skin condition characterized by increased rates of wound healing due to upregulation of epidermal growth factor receptor (EGFR) and certain subunits of the N-methyl-d-aspartate receptor (NMDAR) (Nanney et al. 1986; Morhenn et al. 2004), the activities of EGFR and NMDAR in relation to wound healing in PD is unclear.