  Left unital Kantor triple systems will be shown to correspond to structurable
algebras endowed with an involutive automorphism. A related result is proved
for (-1,-1) Freudenthal-Kantor triple systems. Some consequences for the
associated 5-graded Lie algebras and superalgebras are deduced too. In
particular, left unital (-1,-1) Freudenthal-Kantor triple systems are shown to
be intimately related to Lie superalgebras graded over the root system of type
B(0,1).
