FIG. 3.

Fluorescent light micrograph (magnification, ×100) of intestinal bacteria on food particles labeled with 16S rRNA gene oligonucleotide probes. (A) Total eubacteria are stained with Cy5 (blue, A), enterobacteria are stained with FITC (green, B), and bifidobacteria are stained with Cy3 (red, C). (B) Members of the Eubacterium rectale-C. coccoides group are stained with Cy3 (red, A), and bifidobacteria are stained with Cy5 (blue, B). (C) Large numbers of bacteroides stained with FITC (green, B) interspersed with bifidobacteria stained with Cy5 (blue, A) can be seen.