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There are two classifications of human blood groups: the AB0 system, where 0 is the 1st blood group, A is the 2nd, B is the 3rd blood group and AB is the 4th. And by the presence (Rh+) or absence (Rh-) of the Rhesus factor. Thus, we get a total of 8 possible blood groups. You can view the full video library on Osmosis Prime: http://osms.it/more. Hundreds of thousands of current and future doctors are learning with Osmosis. We have unparalleled tools and materials to prepare you to succeed in medical school exams and as a future doctor. Sign up for a free trial: http://osms.it/more. Subscribe to our YouTube channel: https://clck.ru/JMpxu And to the original Osmosis channel: http://osms.it/subscribe. Get early access to our upcoming video releases, how-to questions, giveaways and more by following us on social media: Facebook: http://osms.it/facebook Twitter: http://osms.it/twitter Instagram: http://osms.it/instagram #blood #AB0 #Rh #rhesus #red blood cells #bloodtransfusion