Extract footprint data for a set of transcription factors or metafeatures.
This function will pull accessibility data for a given feature (eg, a TF),
and perform background normalization for each identity class. This is the
data that's used to create TF footprinting plots with the
PlotFootprint() function.
Value
Returns a data.frame with the following columns:
group: Cell group (determined by group.by parameter
position: Position relative to motif center
count: Normalized Tn5 insertion counts at each position
norm.value: Normalized Tn5 insertion counts at each position
feature: Name of the footprinted motif
class: observed or expected