Reporter of Doc element transposition. Contains a complete copy of the Doc retrotransposon (flanked by P-element ends) with an EGFP cassette inserted in the antisense direction in the non-coding sequence of Doc. The EGFP sequence contains a disruptive intron that can be spliced during transcription of the retrotransposon, but not during transcription of EGFP. Thus, EGFP protein is only expressed after mobilization of the Doc element in the reporter transgene, which generates a new copy of Doc containing EGFP without the disrupting intron.