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Assay of protein A in live cell suspensions (A) and extracts (B) of S. aureus strains Cowan (■), Wood (●), type 5 (⧫), type 8 (▴), MRSA1 (□), MRSA2 (○), MRSA3 (◊), serotype 18 (▵), and S. epidermidis ATCC 12228 ().