TFE was performed using the ChIP Enrichment Analysis (ChEA, 2015 release) available with the Enrichr bioinformatics tool (http://amp.pharm.mssm.edu/Enrichr/enrich) (20). From an input gene list of MMS/sorafenib DEG, the ChEA program computes over-representation of transcription factor targets based on shared overlapping targets and binding site proximity from the ChIP-x (CheA) database.
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