FIG. 1.

Structures of (E)(Y)WS, (E)(Y)SW, and (E)(Y)W transgenic constructs and their derivatives. The derivative pairs used in complementation tests for each construct are shown. Black boxes marked with an E are enhancers of the yellow gene. Coding regions of the yellow gene and the mini-white reporter gene are shown as gray and white boxes, respectively. Thick, short arrows in the boxes indicate promoters of yellow or mini-white. Thin arrows in the boxes indicate the direction of transcription. Black crossing indicates disruption of transcription resulting from excision of the promoter or part of the coding region. White and black triangles are FRT and LOX sites, respectively. Black circles marked with an S are the gypsy insulators.