S100A9 and infection: Like in the comparison of MN to WN wild type pups, WN S100a9-/- pups responded to both of these infections with more severe intestinal inflammation (Supplementary Figs. 4a, c, e, g), stronger LI length restrictions (Supplementary Figs. 4b, f), and higher bacterial translocations into organs (Supplementary Figs. 4d, h) than WN wild type pups.