CXCR2 and necrotizing enterocolitis: The relative expression of CXCR2 was also notably upregulated in the NEC group 3 (1.38 ± 0.32 vs. 1), 24 (1.86 ± 0.10 vs. 1.21 ± 0.07), and 72 (2.56 ± 0.03 vs. 1.21 ± 0.08) h after intragastric administration, compared to their control groups (P < 0.01).