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Immunoblot analysis of antigen I/II expression in the cell extract (lanes 1 to 5) and supernatant (lanes 6 to 10) of S. intermedius NCTC 11324 (lanes 1 and 6) and the isogenic mutant IB08981 (lanes 2 and 7) and of S. mutans LT11 (lanes 3 and 8) and the isogenic mutants IB10991 (lanes 4 and 9) and IB03987 (lanes 5 and 10). The positions of the molecular mass markers are indicated.
