Basicly this function restricts all startSites, to the upstream GRangesList objects end. Usually leaders, for CAGE. Example: leader1: start on 10, leader2: stop on 8, extend leader1 to 5 -> this function will resize leader1 to 9, to be outside leader2, so that CAGE reads can not wrongly overlap.
The 5' leader sequences as GRangesList
The 5' leader sequences as GRangesList shifted by CAGE
GRangesList object of restricted fiveUTRs
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