Full-length forms and short forms of the GATA1 protein. A map of the Gata1 locus is shown in the center (Gata1 gene). The exons are shown as blocks. Gray indicates noncoding sequence; blue indicates coding sequence. Above the gene, a spliced, full-length Gata1 messenger RNA (mRNA) is shown with the AUG initiation codon indicated. This RNA is translated into full-length GATA1 protein (top). The N-terminal domain, the N-terminal zinc finger (NF), and the C-terminal zinc finger (CF) are indicated. Below the gene, a spliced variant Gata1 mRNA encoding the variant GATA1s protein is shown, with the alternative GATA1s AUG initiation codon indicated. This RNA is translated as the GATA1s protein. The N-terminal zinc finger and the C-terminal zinc finger are indicated.