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Principal-component analysis (PCA) of identified extracellular proteins of the investigated A. actinomycetemcomitans R isolates and S strains. The PCA plots are based on the NSAF values of extracellular proteins identified for the R and S groups. (A) All identified extracellular proteins; (B) all identified extracellular proteins except the extracellular cytoplasmic proteins (ECPs).
