Proteins are large molecules composed of amino acids that play a crucial role in various biological processes. They are essential for the structure, function, and regulation of cells, tissues, and organs in the body. Proteins carry out diverse functions such as catalyzing chemical reactions, transporting molecules, serving as signaling molecules, and providing structure and support to cells. Research in the field of proteins focuses on understanding their structure, function, interactions, and regulation, as well as their role in health and disease. Scientists study proteins using a variety of techniques such as protein purification, structure determination, and functional assays to gain insights into their biological roles and potential therapeutic applications.