Red blood cells (also referred to as erythrocytes) are the most common type of blood cell and the vertebrate organism's principal means of delivering oxygen (O2) to the body tissues via the blood flow through the circulatory system. They take up oxygen in the lungs or gills and release it while squeezing through the body's capillaries. These cells' cytoplasm is rich in hemoglobin, an iron-containing biomolecule that can bind oxygen and is responsible for the blood's red color. Synonyms: Monoclonal Red Blood Cell antibody, Monoclonal RBC antibody, Monoclonal Erythrocyte antibody, Anti-Red Blood Cell antibody, Anti-Erythrocyte antibody, Red Blood Cell antibody, RBC antibody, Erythrocyte antibody.