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A ball and stick + ribbons model of Human Hemoglobin, the protein in red blood cells which transports oxygen around the body. Getty Images.

CHAPTER THREE: Blood cells and how they are formed.

Part two. Read part one from here. Red bone marrow contains the hematopoietic stem cells that produce all blood cells – red blood cells, white blood cells, and platelets. Hematopoietic…

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