In humans, the blood group is categorized under four groups are found: A, B, AB, and O. These blood groups are categorized on the basis of the presence or absence of surface protein. The other factor in categorizing the blood groups is the presence of Rh factor. Rh Factor or Rhesus factor is the inherited protein present on the surface of red blood cells.

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Chapter 18, Problem 5CAL

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In humans, the blood group is categorized under four groups are found: A, B, AB, and O. These blood groups are categorized on the basis of the presence or absence of surface protein. The other factor in categorizing the blood groups is the presence of Rh factor. Rh Factor or Rhesus factor is the inherited protein present on the surface of red blood cells.

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