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Exogenous protease rescues swarming motility in a nonswarming, protease-deficient strain. Swarming behavior of A164Δ10 untreated control (A) or with 0.065 (B), 0.65 (C), or 6.5 (D) U of proteinase K is shown. Swarm plates were incubated at 37°C for 24 h. Swarming motility was also rescued by treatment with subtilisin and dispase I treatment (data not shown) at all concentrations except the lowest (see Materials and Methods for concentrations tested and inoculation method).
