Results of KEGG pathway enrichment analysis revealed that most of the up-regulated mRNAs were involved in the Fc gamma R-mediated phagocytosis (such as NCF1, PRKCB, RAC2, and WAS), chemokine signaling pathway (such as CCR2, NCF1, PIK3R5, and PIK3R6) and Staphylococcus aureus infection (such as C5AR1 and FPR1) (Figure 6C; Table 4). This evidence concerns the gene RAC2 and staphylococcus aureus infection.