The present invention relates to a NK cell receptor and its use for diagnosing antibody-mediated rejection (ABMR) and predicting the prognosis after kidney transplantation, and it is possible to diagnose or predict transplant rejection after kidney transplantation. However, in particular, it is possible to diagnose antibody-mediated rejection by distinguishing it from T cell-mediated rejection and/or mixed rejection, so that the cause of kidney transplant rejection can be diagnosed more precisely and precisely, and treatment methods can be determined.
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