Chinese hamster ovary (CHO) cells are a type of cell line derived from the ovaries of the Chinese hamster, a small rodent. These cells are widely used in biological and medical research, particularly in the production of recombinant proteins and monoclonal antibodies. CHO cells are favored for their ability to grow in culture and their capacity to perform post-translational modifications similar to those in human cells. Due to their versatility, CHO cells have become a standard in biotechnology and pharmaceutical industries. They are instrumental in the development of vaccines and therapeutic proteins, making them crucial for advancements in medicine. Their use has significantly contributed to the field of biotechnology and the production of biopharmaceuticals.