unc-22 [st136::Tc1] has a Tc1 insertion in the unc-22 gene. When transposition of Tc1 in the germline occurs, unc-22 function may be restored in progeny.
Animals exhibit variations in the activity of endogenous transposons compared to control. In C. elegans transposon activity is often measured by the rate of reversion of mutations induced by transposon insertions.