extremely significantP -value ≤0.01
The expression difference level was defined as follows: extremely significant (**) if (fold change ≥1 or fold change ≤ –1) and P -value ≤0.01; significant (*) if (fold change ≥1 or fold change ≤ –1) and 0.05 ≥ P -value >0.01; and otherwise non-significant.