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How many blood types are there?

there are somany...how are they named? why are they named the way they are?

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A, B , AB and O. But of course, there are both positive and negative for each blood type. By the way, if i have any mistake here, please correct me. :)

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There is. This is only TEACHED ones. They depend on proteins. There is a M and N proteins too. I think there are more proteins.
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TEACHED ones at school*
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@immob.... BlurCase is absolutely! correct. Stay in school where you can be "teached" more
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Well, thanks for correcting me.
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MonaSez are you a biologist or something?
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No, but I've been a blood donor for over 20 years and I've asked questions and learned about the process.
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BTW, blurcase, maybe you want to know more about M and N groups at blood?

http://en.wikipedia.org/wiki/MN_blood_group
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MonaSez just press to the link.
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Sure, learning is part of growing.
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@immob ... Wikipedia's information is questionable. If there is research or new discoveries I will wait until it is verified by a more legitimate source, such as:
http://www.nobelprize.org/educational/medicine/landsteiner/readmore.html

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Oh come on! Firstly They teached me at my High School in Turkey so the Ministry of Education in Turkey trusted to this information and corrected it. I trust to my education system.(I told that they are not teaching in school because they are not teaching in America and %90 of here is American so I assumeed that BlurCase is American too). So, I wont question this info, I am thinking it is correct. If you want to question it, you can of course. But dont forget. This guy found this thing at 1901 and since 1901 technology has been developed.
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I'm not saying you're wrong, in fact, this research may find more groups, but either way... I will wait
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Well, i am not American...I am Asian.
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alot

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Well, there are lots of. There are lots of proteins in a blood. I know 3 groups of them only. (A, B, AB and 0), (Rh+ and Rh-), (M and N) but as I said, these are the only ones that I know, there are looooots of.

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