Cytochrome is a type of protein found in the cells of many living organisms. It plays a crucial role in the process of cellular respiration, where it helps transfer electrons in the electron transport chain. This process is essential for producing energy in the form of ATP. There are several types of cytochromes, each with a specific function and structure. They contain a heme group, which is responsible for their ability to carry electrons. Cytochromes are also involved in various biochemical reactions, including the metabolism of drugs and toxins in the liver.