Study of Alloimmune Response in Humoral Rejection After Kidney Transplantation

Inclusion Criteria: * Kidney transplant recipient, male or female, 18 years of age or older * Patient undergoing a kidney allograft biopsy, according to the usual protocol of the service * Subject affiliated with a social health insurance scheme. * Subject capable of understanding the objectives and risks associated with the research and expressing non-opposition Exclusion Criteria: * Inability to provide the subject with clear and proper information (difficulties in understanding the subject, ...) * Refusal of the patient to participate in the study * Subject under guardianship or curatorship * Subjects under legal protection