Fig. 7. Model for the transcriptional regulation of ATML1 in embryogenesis. (A) Regulatory organization of the ATML1 promoter. Target regions of putative positional signals (arrows) are indicated. Sequence numbering refers to the distance in bp from the transcription start site (+1). (B) Regulation of ATML1 expression in embryogenesis. Each color represents a different expression domain. The regulatory sequences that mainly contribute to the expression in each domain are indicated (see text for details). Successive embryo stages are depicted (from left to right): one-cell stage, eight-cell stage, globular stages, heart stage.