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Dot blot analysis of the localization of P1 and its internal-deletion derivatives in htrA-positive and htrA-negative strains of S. mutans. P1 and the internal-deletion polypeptides present in the indicated fractions of PC3370A to -D and corresponding ΔhtrA strains were identified by dot blotting using monospecific anti-P1 rabbit polyclonal antiserum 218.
