Per group get the part upstream of position. upstreamFromPerGroup(tx, stopSites(fiveUTRs, asGR = TRUE)) will return the 5' 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.
If you don't want to include the points given in the region,
a GRangesList of upstream part
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