Extend regions from a Genomic Ranges object

This function extends each region in a Genomic Ranges object by a designated upstream and downstream extension in a strand-aware fashion

extendGR(gr = NULL, upstream = NULL, downstream = NULL)

Arguments

gr	A GRanges object.
upstream	The number of basepairs upstream (5') to extend each region in gr in a strand-aware fashion.
downstream	The number of basepairs downstream (3') to extend each region in gr in a strand-aware fashion.