One hundred percent of the DRG neurons expressing kainate receptors are included in the LA4 and LD2-labeled subpopulation both at P1 and P6. A, Five of eight P6 DRG neurons show Ca²⁺ responses to kainate, whereas three do not. B, The cells were fixed and then stained with both LA4 and LD2. Seven of eight neurons show a positive staining with LA4 and LD2. One large DRG neuron on the top leftshows negative staining with LA4 and LD2 and no Ca²⁺response to kainate. C, The percentages of kainate-responsive neurons are similar in P1 and P6 DRG neurons.D, All of the kainate-responsive neurons show expression of LA4 and LD2 in P1 and P6. The numbers above eachbar represent the number of positive neurons over the total.