Although changes in the dopamine innervation of the thalamus in the parkinsonian brain have never been reported in as much detail as here, our findings concur with previous data in the literature on MPTP monkeys and humans with PD.34, 35, 36, 37, 38 One study, which used an acute MPTP intoxication protocol (intracarotid and intrastriatal injections) in rhesus monkeys (n = 5), found a qualitative decrease in DAT‐ir axons in the thalamus, including R.37 The findings from this study cannot be directly compared with the present ones because of differences in methodology. This evidence concerns the gene SLC6A3 and Parkinson disease.