Fig. 1

Outline of the algorithm. a Flowchart of the algorithm is shown with different steps explained in text. b, c The DISCRETIZE step of the algorithm is shown on two representative genes. Here, the expression level of two genes at different conditions taken from an experimental data is plotted in left panels in B and C. In right panels, the sorted absolute normalized values of expression data for the two respective genes are plotted. Arrows correspond to the point above which the expression values are characterized as expressed by the algorithm and the corresponding expression values are shown by circled values here and in actual expression data in left panels in B and C. This point is captured by taking the consecutive differences of sorted absolute normalized expression profile and identifying the index where this difference is maximum