Patient serum was collected before transplantation and was screened for the presence of class I and class II anti-HLA antibodies (HLA abs) of the immunoglobulin G type with a LABScreen Mixed Kit (One Lambda, Canoga Park, CA, USA) according to the manufacturer’s instructions and as previously reported9 (link). The mean fluorescence intensity (MFI) of the anti-HLA antibodies was adjusted for the background signal using the formula described previously. Samples with an MFI of 500 or more considered to be positive.
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