Targeted transposition of a P{GMroX1.MS2-6} element to the P{lArB} element in roX1MB710, resulting in the precise replacement of the P{lArB} element with the P{GMroX1.MS2-6} element. The P{GMroX1.MS2-6} element is oriented such that the 5' end of the element is proximal to the roX1 promoter.