text: SNItrans resulted in a mixed population of axotomized and intact 
  afferents within the L4 DRG. Therefore, we developed an approach 
  to restrict our analysis to axotomized afferents, without relying on 
  transgenic labelling, and used this as a complementary approach to 
  confirm our findings. We injected the neuronal tracer FB into the 
  glabrous, tibial innervation territory of both hindpaws 1 week before 
  common peroneal and tibial transection (SNItrans) or crush (SNIcrush) 
  surgeries (Figs. 2A and B). FastBlue-uptake was complete across 
  neurons of all sizes by 1 week (Fig. S3, http://links.lww.com/PAIN/ 
  C84), so this approach allowed us to profile a sample of the 
  axotomized afferents. Both SNItrans (Fig. 2C) and SNIcrush (Fig. 2D) 
  injuries resulted in a rightward shift in population distributions of the 
  cross-sectional area of nucleated, FB-labelled DRG neurons when 
  compared with contralateral DRG, consistent with a loss of small 
  afferents post–nerve injury. 