In this task, you are given a sentence. You are expected to recognize the name of gene or protein. Although there might be several correct answers, you need to write one of them.
Q: In this study , we obtained PBL from Epstein - Barr virus ( EBV ) IgG antibody positive kidney transplant recipients ( R ) and their living - related donors ( LRD ) one year after renal transplantation .
A:
IgG antibody