Imprecise excision which leaves about 3.6kb of the original P{EP} in place (the promoter region of the element is intact) and does not remove JIL-1 sequence.
41% of embryos derived from JIL-1z2/JIL-1z28 females mated to wild-type males hatch, of those larvae that hatch, 71% survive to pupation, and of those that survive to pupation 94% eclose.
General trend from least to most viable is: JIL-1z2 < JIL-1h9 < JIL-1z60 < JIL-1EP3657 < JIL-1z28 ~ JIL-1Scim.