Fig. 2. Rescue by prd transgenes of prd functions in accessory gland development. Maps of prd transgenes listed in the left column are shown, while their abilities to rescue accessory gland (acg) formation, Prd expression in adult accessory glands, and male fertility in prd mutant males rescued by prd-Gsb or prdRes are indicated on the right. The Prd-coding region is indicated as open boxes, interrupted by the v-shaped prd intron, with the paired-domain PD hatched and the prd-type homeodomain HD stippled, and upstream and downstream sequences as straight line. Positions of transcriptional starts (0) and poly(A) addition signal (AATAAA) are marked, and the Gal4-coding region is shown as open box. The region including the enhancer responsible for the development of functional accessory glands, PMFE (Prd Male Fertility Enhancer), has been mapped to a 0.8 kb fragment downstream of the EcoRI site in the prd downstream region. Restriction sites in parentheses have been destroyed. B, BamHI; P, PstI; Pv, PvuII; R, EcoRI; Xb, XbaI; Xh, XhoI.