Calmodulin is a small protein that plays a critical role in regulating various cellular processes by binding to and modulating the activity of other proteins. It is a key calcium sensor in cells, meaning that its function is to sense changes in calcium levels and transmit this information to various target proteins. Calmodulin is involved in a wide range of cellular processes such as muscle contraction, neurotransmitter release, and gene expression. Research in the field of calmodulin focuses on understanding its structure, function, and regulation, as well as its role in various physiological and pathological conditions. Studies on calmodulin have provided valuable insights into the mechanisms underlying cellular signaling and regulation.