I'm in need of experimentally validated microRNA negative interaction. I got validated positive interactions from mirtarbase. But I don't know where to get negative ones. Please share if you have such a data or you know a database to get them.
I have once used this paper's (http://nar.oxfordjournals.org/content/41/18/8421.short) Supplementary data ( see also "Materials and Methods" section, second paragraph).