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In situ identification of C. taeniospiralis 51k within its host, P. tetraurelia. Identical microscopic fields are depicted. The fluorescence images (B to D) show a median section through the paramecium cell seen in the simulated phase-contrast image (A). Shown is FISH using the FLUOS-labeled oligonucleotide probe EUB338 (B), the Cy3-labeled endosymbiont-specific probe S-S-Ctaenio-129-a-A-18 (C), and the Cy5-labeled endosymbiont-specific probe S-S-Ctaenio-998-a-A-18 (D). Bar, 20 μm
