GF 129 WT mice receiving HM1, NIMM-g1, or NIMM-g2 fecal transplant did not develop colitis as assessed by colon histology, non-invasive fecal lipocalin-2 (f-LCN2), and tissue inflammatory cytokine levels (Fig. 1B–D; Figure S1B, C). Here, LCN2 is linked to colitis.