Included within a 7963bp genomic XhoI-XbaI fragment containing part of nsl1, the complete coding regions of Acyp2, c(3)G and Uros2 and part of CG9590.
wild-type
c(3)G+tX203 rescues c(3)G68
Restores exchange on the X chromosome in c(3)G68 females to a slightly higher level than wild type.