The present invention relates to oligonucleotides for modulation of targetRNA activity. Thus, the invention provides oligonucleotides that bind to microRNAbinding sites of target RNA. The oligonucleotides may activate RNase H or RNAi.In a preferred embodiment, the oligonucleotides prevents a microRNA from bindingto itsbinding site of the target RNA and thereby prevent the microRNA from regulatingthe target RNA. Such oligonucleotides have uses in research and developmentof new therapeutics.