NTRK1 and infection: Of the mCherry-labeled DRG neurons, 97 ± 2.6% were NF200+, 1 ± 2.2% were Plxnc1+;P2X3+, 58 ± 18.8% were TrkA+, and 0.7 ± 2.1% were TH+ (Fig. 3G–J), indicating that the central terminals of NP and TH neurons are largely resistant to retrograde infection with either SAD-G-pseudotyped or N2C-G-pseudotyped rabies virus.