Cells at Work Keychains are a type of collectible merchandise based on the popular manga and anime series “Cells at Work!”. These keychains typically feature characters from the series, such as red blood cells, white blood cells, and various pathogens, in cute and stylized designs. They are a popular choice among fans of the series as a way to show their love and support for the franchise, and can be attached to bags, keys, or other personal items for display.