An erythrocyte (or red blood cell) is one of the many different cells contained in the blood along with leukocytes and platelets. Every second, 2-3 million red blood cells are created. These are made from the haemopoetic pluripotent stem cells in the bone marrow.
There are four main blood groups: A, B, O and AB.
These are caused by different antigens attached to the erythrocyte. They also have different sugars.
A blood group contains N-acetyl-galactosamine whilst B blood group contains just galactosamine.
- ↑ Blood Groups and Red Cell Antigens, Dean.L., -http://www.ncbi.nlm.nih.gov/bookshelf/br.fcgi?book=rbcantigen