Considering previous reports that the neonatal immune system is a critical regulator of the biliary atresia phenotype [29, 30] and that a low diversity of the gut microbiota is linked to intestinal inflammation [9, 31, 32], we measured bacterial α-diversity within each group by calculating the observed number of taxa, Chao1, Dominance and Shannon H. The α-Diversity was not different in saline-control mice regardless of the mouse strain (WT or Cxcr2-/-) or type of diet (regular or SMZ/TMP) (S2A Fig). Here, CXCR2 is linked to biliary atresia.