The PBac{RB} element contains (from 5' to 3'): a w+mC marker, a single long (199bp) FRT site and a splice acceptor site (in the opposite orientation to the w+mC marker). The presence of the splice acceptor site in addition to the w+mC marker results in the element being mutagenic in both orientations.
A diagram of the PBac{RB} element is available at the [GDP Transposons page](http://flypush.imgen.bcm.tmc.edu/pscreen/transposons.html)
5.971
PBac 5\'
PBac 3\'
report comment: Corresponds to coordinates 2404-8938 in GB:AY515147.