By using the slider bar or the text boxes provided by ChIPseek, user can specify a target region of interest and filter the peaks based on the length of peaks. User may save this new subset of peaks. A new histogram will be generated for this subset of peaks that pass the filter. The range and number of peaks will be shown on the top of the histogram. User can save this subset by pressing the “save“ button on top of the new histogram and find this file in the following analysis tools.