NUS1 and multiple system atrophy: The ROC curve showed that the AUC values of plasma NgBR in distinguishing PD from HC, MSA, and PSP were 0.6832, 0.6716, and 0.6628, respectively, suggesting that plasma NgBR may have the potential to assist in differentiating PD from healthy controls and Parkinson‐Plus Syndromes (Figure 4).