TREM1 and infection: The three most strongly upregulated genes in the cornea in response to infection were CXCL8, solute carrier family 2 member 3 (SLC2A3) and TREM1. While the downregulated genes were ribosomal protein S27a (RPS27A), ribosomal protein L13a (RPL13A), BAG cochaperone 1(BAG1) and pancreatic progenitor cell differentiation and proliferation factor (PPDPF).