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In page Scarlet fever:

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The speA gene was cloned and sequenced in 1986.[5] It is 753 base pairs in length and encodes a 29.244 kilodalton (kDa) protein. The protein contains a putative 30-amino-acid signal peptide; removal of the signal sequence gives a predicted molecular weight of 25.787 kDa for the secreted protein. Both a promoter and a ribosome binding site (Shine-Dalgarno sequence) are present upstream of the gene. A transcriptional terminator is located 69 bases downstream from the translational termination codon. The carboxy terminal portion of the protein exhibits extensive homology with the carboxy terminus of Staphylococcus aureus enterotoxins B and C1.[citation needed]