Per group get the part downstream of position. downstreamOfPerGroup(tx, stopSites(cds, asGR = TRUE)) will return the 3' utrs per transcript as GRangesList, usually used for interesting parts of the transcripts.
a vector of integers, for each group in tx, where is the new start point of first valid exon. Can also be a GRangesList, then stopsites will be used.
If you want to include the points given in the region, use downstreamFromPerGroup
a GRangesList of downstream part
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