Partial sequence of the human and murine UROS erythroid-specific promoters showing the GATA1 and CP2 transcription factor binding sites. The location and orientation (<, >) of the GATA1, E-box, and CP2 erythroid binding elements are indicated, as are the four novel promoter mutations causing CEP (−70C, −76A, −86A and −90A). Dots are placed every tenth nucleotide. The homologous CP2 site from the α-globin gene promoter and the GATA1 site from the human stem cell leukemia (SCL) gene promoter are shown.