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  • Double peaks for BOTH forward and reverse tags in macs2 model of Chip-seq data - shal

    I analysed 3 chip-seq replicates (each with its own input control) using macs2. For two of the samples the model produced by macs2 looked fine. I am pasting an example below:



    For one of the samples the model graph for both the forward and the reverse tags seems to exhibit double peaks:



    This normally happens if you mix libraries of different fragment sizes but this is not the case. Shall I be concerned? What would you do?

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