The product,E,of the following reaction sequence, 
would be: 
Definitions:
Heme Group
A component of hemoglobin in red blood cells, responsible for the transport of oxygen.
Oxygen Molecules
Diatomic molecules consisting of two oxygen atoms, essential for respiration in living organisms.
Hematopoiesis
The process of forming new blood cells, including red blood cells, white blood cells, and platelets, in the body.
Erythrocytes
Red blood cells that transport oxygen from the lungs to the body tissues and facilitate carbon dioxide transport back to the lungs.
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