Imprecise excision of the P{EPgy2}McrEY07421 insertion, leaving 25bp of the 3'end of the P{EPgy2} element, and 26 nucleotides that are an incomplete duplication of Mcr sequence. The entire coding sequence of Mcr is intact and the upstream Bsg gene is also unaffected.
Mutant embryos show defects in septate junction structure in the salivary glands, hindgut and trachea (assayed by cora protein localisation).