Fig. 9. Representative double-immunofluorescence images showing coexpression of enkephalin (Enk), β-endorphin (End), or dynorphin (Dyn) with CD45 receptors (CD45R) in immune cells at injured nerves of wild-type C57BL/6C, nonobese diabetic (NOD/Lt), and nonobese diabetic–severe combined immune deficiency (NOD-SCID) mice at days 3 and 14 after partial sciatic nerve ligation (PSNL).