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Principal component analysis (PCoA) of four respiratory tract sample types (n = 6 for each sample type) and samples from the oral cavity of healthy individuals (n = 16) according to the microbial composition, as inferred by pyrosequencing of the 16S rRNA gene. BAL = bronchoalveolar lavage; Bas = bronchial aspirate; Oral = supragingival dental plaques; Sp = sputum; Ts = tissue. Reprinted by permission from Reference 85.
