Schematic presentation of the three S. equi proteins EAG, SFS, and FNZ. Abbreviations: S, the signal sequence; W, the cell wall-associated domain; M, the membrane-spanning region. For protein EAG the albumin-binding region Alb is indicated. For proteins FNZ and SFS different repetitive regions are indicated by R. Arrows indicate the part of the respective protein that was used for antigen preparation. The deduced molecular mass for proteins EAG4B, SFSC1, and FNZN are indicated.