CCL2 and infection: Monocyte chemotactic protein 1 (MCP-1), a small heparin-binding chemokine secreted by monocytes, macrophages, and dendritic cells, also participates in the recruitment of immune cells to the site of infection [7], and TNFα can interact with the neonatal intestinal lumen [6], triggering mucin secretion in the gut and respiratory system [8].