Definition: A rhabdosphere, also known as a "rhabdoid" or "rhabdoid body," is a type of plasma cell in the human body that produces and sequesters hemoglobin. Hemoglobin is an essential protein that carries oxygen throughout the body and helps to transport carbon dioxide out of cells. The rhabdosphere is located in the bone marrow, where it secretes the hemoglobin into the bloodstream. The rhabdosphere plays a crucial role in regulating