Peptide inhibitors are small molecules made up of amino acids that can block the activity of specific proteins or enzymes in the body. These inhibitors are often used in research and drug development to study the function of certain proteins and to design new therapeutic agents for various diseases. Peptide inhibitors can be designed to specifically target a particular protein or enzyme, making them useful tools for understanding the molecular interactions that drive important biological processes. They can also be used as potential drug candidates for diseases such as cancer, Alzheimer's, and infectious diseases. Overall, peptide inhibitors play a vital role in the field of molecular biology and drug discovery.