Fig. 1. Representative autoradiograms of the basal and DAMGO ([D-Ala,2N-MePhe,4Gly5-ol]-enkephalin,10 μm)- or DPDPE ([D-Pen,2D-Pen5]-enkephalin,3 μm)-stimulated [35S]GTPγS binding in the lumbar spinal cord from a normal and a diabetic rat. Note that the tissue sections were presented with the pseudocolor scale for better visualization of the density changes in the spinal dorsal horn. The density indication bar is shown on the right side.