keepCTCFloops returns loops that are nearby CTCF peaks
as determined by some external data in a GRanges object
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A loops object whose loops will be annotated
GRanges object corresponding to locations of CTCF peaks
This function works similar to the
annotateLoops function but
returns only CTCF loops that are defined in this function.
However, loops in
annotateLoops may have a different annotation
based on their priority scheme. For example, an e-p loop from
annotateLoops may be returned as a CTCF loop by this function
if the loop had both annotations. These peaks don't necessarily
need to be CTCF peaks, so using a GRanges object with enhancers
or promoters to determine e-e loops and p-p loops could also
be used in this function
A loops object with all loops having both anchors in the GRanges region
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