Fiber Sets up the Battleground for Intestinal Prevotella.

In this issue of Cell Host & Microbe, Gálvez et al. employed metagenomic and phylogenetic analysis to systemically characterize murine Prevotella spp. Isolation of representative strains identified key fitness determinants, including arabinoxylan utilization loci, in a dominant murine colonizing strain and conserved in human gut microbiota, collectively facilitating the understanding of niches in the gut microbiota.