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Protein A gene map. Boxes indicate segments of the gene coding for the signal sequence (S), the immunoglobulin G-binding regions (A–D), a region homologous to A–D (E), and the COOH terminus (X), which includes the SSRs (Xr) and the cell wall attachment sequence (Xc). Primers are numbered from the 5′ end of the primer on the forward strand of S. aureus (GenBank accession no. J01786 [29]).
