A 904 bp tin-bound region within the third intron of eya ("eya-meso") drives expression of EGFP tagged with a nuclear localization signal (Tag:NLS(tra)).
Reporter expression is observed in the mesoderm at embryonic stage 9 and is reduced in the dorsal mesoderm while remaining high in the ventral mesoderm in stage 10 embryos. It colocalizes with tin expression in stage 9 embryos but the pattern diverges at stage 10.