PTPRC and necrotizing enterocolitis: Furthermore, when assessing the total proportion of CD45-positive cells and neutrophils in the lamina propria, we determined that NEC significantly increased the number of CD45 cells (Supplementary Fig. 4k), the number of neutrophils (Ly6G + cells, Supplementary Fig. 4l), and the percentage of CD45 cells that are neutrophils (Supplementary Fig. 4m) in both wild-type and Ahr-/- mice.