"City-state" Natural Recordings by Native Speakers
A city-state is a political entity that is both a city and a sovereign state, typically with a very small population and a defined territory. City-states often have their own governments, laws, and institutions, but may also be part of a larger country or confederation.
Usage Examples: City-State
Citrullination is a post-translational modification of proteins in which an amino acid called citrulline is inserted into the protein in place of the amino acid arginine. This process is often referred to as a "deimination" reaction. Citrullination is a key step in the formation of citrullinated proteins, which have been implicated in various physiological and pathological processes, including autoimmune diseases such as rheumatoid arthritis and cancer.