Eight copies of the Tag:MS2 stem loop have been introduced into the end of the 3'UTR of a full-length HeT-A element in which the HeT-A\gag protein is tagged with Tag:HA and Tag:FLAG (HeT-A\gagUAS.Tag:HA,Tag:FLAG).
UASt regulatory sequences drive expression of HeT-A\gag tagged at the 3' end with Tag:HA and Tag:FLAG.