Hi all,
I'm trying to use Diffbind to identify differentially open regions (identified using ATAC-seq) between three different cell types. I have three biological replicates for each cell type. 
I'm building now the sample sheet to import the data into Diffbind, but I don't know what I should indicate as a control since ATAC do not have controls. Is there a way to avoid this problem? 


Control reads, such as those from an Input sample, are optional in DiffBind, so you can just leave out the control column in the sample sheet.