PEV can be restored by low temperature and removing Y heterochromatin. E(var)3-201 enhances PEV such that brnpr-6/Y/Dp males die, although E(var)3-201 does not affect dor variegation.
Selected on basis of reversion of position effect lethality of T(1;2)dorvar7 acting through br.
Complementary, Ts(2Lt;2Rt), segregant was not recovered.