NTRK1 and infection: Analysis of these 6 genes showed that infection was heavily biased towards Ntrk1+ neurons (Figure S2), since Ntrk1 gene (encoding TrkA protein) expression was significantly over-represented in YFP+ neurons: 86% of the YFP+ neurons in the infected DRG were Ntrk1+ compared to only 34% YFP− neurons (Figure 3D).