TLR7 Induces CCL2 Expression in Neurons via NF-κB Research Background Toll-like receptors (TLRs) are one of the important mechanisms for recognizing specific molecular structures of microbes. In humans, ten TLRs (TLR1-10) are known, among which TLR3 and TLR7 are located on the endosomal membrane and play important roles in sensing virus-derived nuc...