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ser and sej genes are carried by two kinds of staphylococcal plasmid. The pF5-like plasmids and pIB485-like plasmids were purified from S. aureus laboratory strains, food poisoning outbreak isolates, and healthy human isolates. These plasmids were digested by EcoRI and then subjected to Southern blot analysis. Lanes: 196E, p196E; 361, p361; 1151, p1151; 727, p727; 740, p740; I-7, pI7; I-16, pI16; I-46, pI46; F5, pF5; F6, pF6; and F7, pF7.
