Every time you respond to a pathogen, these alloimmune cells are randomly sprinkled throughout all of your immune responses.
每当机体对病原体产生应答时，这些同种免疫细胞弥散性分布于参与免疫应答过程中。
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Giving an individual a blood transfusion when there is very little trauma is less likely to cause an alloimmune response than giving it to them when they are undergoing a major surgical procedure.