<p>Observed pEC<sub>50 </sub><i>vs.</i> the pEC<sub>50</sub> predicted by Hypo A, Hypo B, Hypo C and SVM model for those molecules in the test set. The solid line, dashed lines and dotted lines correspond to the SVM regression of the data, 95% confidence interval for the SVM regression and 95% confidence interval for the prediction, respectively.</p