Separation of control and PD using OPLS-DA.

<p>OPLS-DA results comparing metabolites from control (black, closed circles) and PD patients (red, open squares) (A). Discriminatory analysis of control and PD patient metabolic data (B). The green dots represent metabolites with 95% correlation to the first two principal components. The gold circles denote the top 1% of these metabolites (154 <i>m/z</i>) that most closely associate with control or PD.