Transgenic construct used in a study to characterize a pairing-sensitive element in the eve 3' boundary region. Contains a 300bp fragment ('PRE300') containing an active portion of a pairing-sensitive element near eve (fragment extends from +8.9kb to +9.2kb relative to the eve transcription start site) and DNA from -275bp to +116bp relative to the eve transcription start site, inserted upstream of the gl binding sites present in w+mCG.