STEAP2 and Parkinson disease: Figure 7 shows that STMP 1 was present mainly in tremor signals from healthy people, although it was also present in tremors from PD individuals. Furthermore, the number of STMP 2s increased substantially in the PD individuals (Figure 8C), and STMP 3 was prevalent in PD individuals with a higher UPDRs score (Figure 8D).