In fact, there are hundreds of receptor types found in cells ... switches to internal signaling pathways. Membrane receptors fall into three major classes: G-protein-coupled receptors, ion ...

The discovery of microbial-sensing proteins called Toll-like receptors is transforming ... TLRs have complex expression patterns in different cell types. Recall that different cell types of ...

Glycoproteins typically bind to receptors on the membrane of a host ... while some viruses have a more limited host range. Some of the different types of host organisms that viruses can infect.