Differentially expressed (DE) miRNAs in the small intestine of rats with or without NEC. (a) The volcano plot shows the DE miRNAs between the NEC rats and the control rats. Red dots and blue dots represent the upregulated and downregulated miRNAs, respectively. The log2(fold change) was ≥1 and FDR was ≤0.05. (b) Heat map of the DE miRNAs in rats with or without NEC. A1, A2, and A3 were the control group; B1, B2, and B3 were the NEC group.