Fig. 2

Receiver Operating Curves (ROC) for a activin B, b activin A, c follistatin and d interleukin 10 (IL-10), for separating CFS/ME participants from healthy study controls recruited at the same time. The blue line represents the cytokine and the green line the 50% threshold of Sensitivity versus 1–Specificity for the protein detected in the CFS/ME or control serum