This cross section of a mouse Colon Chip shows the actin cytoskeleton of epithelial cells in magenta, the overlying mucus in yellow, and the cells' nuclei in blue. The team used this chip in a comparative analysis of mouse and human microbiomes to test their different abilities to induce tolerance to the pathogen Salmonella typhimurium. Credit: Wyss Institute at Harvard University Read Time: Trillions of commensal microbes live on the mucosal and epidermal surfaces of the body and it is firmly established that this microbiome affects its hostâs tolerance and sensitivity to a variety...