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    I would say the main advantage in this is there is no need for cross matching blood. Humans have about 52 antigens on rbc surfaces, the most important of which are the ABO system and the Rhesus antigens.
    Transfusing the wrong blood group into someone results in a haemolytic reaction whereby the recipient's antibodies attack the non-recognised antigens and can cause kidney failure and death. This means in an emergency situation, non cross matched patients can only be given O negative blood.
    There are often problems with transfusing human blood when the recipient has an unusual blood group or rare antigen type. This means blood banks can sometimes run out of the rarer types of blood. It is also a costly process getting people to donate blood and requires healthcare professionals to take the blood from donors.

    The crocodile has this 12 aa sequence which enables O2 to dissociate from Hb and go to the active tissues. If a crocodile is under the water for a period of time, their blood pO2 will fall as they are unable to breathe air in. This sequence will enable the remaining HbO2 to give up its O2 at lower pO2s.
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