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We can use photos showing research that has led to several specific blood substitutes in two classes -- hemoglobin-based oxygen carriers (HBOCs) and perflourocarbons (PFCs). Some of these substitutes are nearing the end of their testing phase and may be available to hospitals soon. Others are already in use. For example, an HBOC called Hemopure is currently used in hospitals in South Africa, where the spread of HIV has threatened the blood supply. A PFC-based oxygen carrier called Oxygent is in the late stages of human trials in Europe and North America.
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