Conserved organization of the SPS + A module in E(spl) promoters. (A) General organization of the SPS and consensus proneural sites (RCAGSTG) upstream of m4, HLHm7, HLHm8, HLHmγ, and HLHmδ in D. melanogaster. Su(H) sites are in orange and proneural sites are in blue. (B) Conserved bases in the SPS + A module in the m4, HLHm7, HLHm8, HLHmγ, and HLHmδ promoters. (C) General organization of the SPS and proneural sites upstream of HLHm7 in nine different Drosophila species. Arrows depict transcription start sites. Su(H) sites are in orange and proneural sites are in blue. Modified A sites (YCAGSTG) are underlined.