Figure 1.

Composite micrographs of the C. elegans microbiome. (A) Composite micrograph of the mouth region of C. elegans, and (B) of the middle part of the worm (anterior is to the left in both cases). Nematodes were raised on an experimental microbiome based on 14 abundant bacterial taxa, followed by microscopic analysis (Dirksen et al., 2016). Bacteria are stained in red with a eubacterial FISH probe and are observed as small dots throughout the entire gut. Worm nuclei are stained in blue with DAPI. The picture in (A) is taken from Dirksen et al. (2016), while that in (B) is new, courtesy of Philipp Dirksen from the Schulenburg lab.