Here's what I know about i71 (or just 71), most of which was only
described in my thesis and never published properly.
I isolated 71 which is homozygous viable, along with three other
insertions, in a PlacZ screen for segmentally-modulated enhancer traps.
Expression occurs in PS3-13 but is more intense in PS4-5 (I have X-gal
pictures). This pattern is reminiscent of the Antp P2 transcript
distribution. The transposon used was from the plasmid pLacA92 as first
described by O'Kane and Gehring. This was mobilised by jumpstart from an
X-insertion line called c49. We did some chromosome in situs and thought
the 71 insertion was probably at 40F (as did Michael Ashburner). However,
given that the expression pattern was so similar to teashirt we sent the
stock to Steve Kerridge. He did some Southerns and I think he failed to
find the transposon within his teashirt genomic walk. I am not sure whether
he redid the lacZ chromosome in situs.