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A maximum-likelihood tree showing CAP-specific bacterial 16S rRNA gene sequences shared by ciliate single cells [18 sequences from the freshly isolated ciliate single cells and 24 sequences from Ent. caudatum (Ent.) and Epi. caudatum (Epi.) in their monocultures]. Relative abundance of each taxon among CAP-specific bacteria was shown in parentheses. Minor taxa (< 0.5% of total sequences) were excluded.
