MMP9 and osteomyelitis: The results showed that patients with osteomyelitis had increased expression of CXCL10, CXCL13, CXCR2, FCGR3B, IL1B, IL8, MMP9, and S100A12 and decreased expression of CXCL9, LCN2, MMP1, and MMP3 compared to normal subjects (Fig. 5).