FliC is a protein expressed in many motile enteric bacteria including Salmonella and Escherichia. The C- and N-terminal regions of the protein among various strains of bacteria are well-conserved. However, there is great variability of length and amino acid sequence in the central region. For example, E. coli flagellin have been reported to vary in size from 36 K to 69 K in MW. The epitope recognized by this FLIC-1 monoclonal antibody is not known. FliC is a subunit protein that polymerizes (in conjunction with other proteins) to form the filaments of bacterial flagella in a precise order. Flagellin is a potent ligand of toll-like receptor 5 (TLR5). By binding to TLR5, flagellin induces activation of NF-kB and triggers the production of cytokines and innate immune responses.