  The most promising MSSM candidates of the heterotic string reveal some
distinctive properties. These include gauge-top unification, a specific
solution to the mu-problem and mirage pattern for the gaugino masses. The
location of the top- and the Higgs-multiplets in extra dimensions differs
significantly from that of the other quarks and leptons leading to a
characteristic signature of suppressed soft breaking terms, reminiscent of a
scheme known as natural supersymmetry.
