Recombination between the two progenitor insertions has resulted in a 21.26kb deletion of sequences within mp which removes sequences that encode the second alternative start codon and 759bp of the triple helix repeat regions (exons 4 to 11). A residual insertion remains.
Scer\FRT-mediated recombination between the two progenitor insertions has deleted the sequence between them.
Homozygous adults eclose several days later than control siblings.
ISNb pathfinding errors are seen in 14.6% of hemisegments in mpΔN4-11 embryos.