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The second most important classification of human blood group is based on Rh antigens.

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For example humans who come from an ancestry which started domesticating cattle, and consuming dairy products have digestive systems which generate an enzyme called lactase which helps in digesting milk by digesting the sugar lactose in the milk.

However a significant population of humans are also lactose intolerant, which means they cannot digest milk products which contain lactose, because their body does not produce lactase.

O-ve means a blood group which has neither A nor B antigens, nor Rh D antigen.

AB-ve means a blood group which has both A and B antigens, but has no Rh D antigen.

So if your blood has only A antigens, then your blood group is A, if it has only B antigens, then your blood group is B, if it has both of these, then your blood group is AB, and if it has neither, then your blood group is O. Now the reason for taking into account this group for blood transfusion is that, if you have A antigen (A Blood Group), then the human immune system will not attack A antigens if the donor’s blood contains A.

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