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Susceptibility of hemoglobin to proteolytic activity of P. gingivalis. W83, wild-type P. gingivalis strain; Δkgp, ΔrgpAΔrgpB, ΔkgpΔrgpAΔrgpB, gingipain mutant strains lacking functional genes encoding lysine-specific Kgp and/or arginine-specific RgpA and RgpB, constructed in W83 strain.
