Detection of multiple HY-Abs. (A) Detection of multiple HY-Abs (HY score) at 3 months post-HCT was associated with their persistence (P < .001 by the Jonckheere-Terpstra test). A high average of overall relative HY-Ab quantifications throughout post-HCT indicates HY-Ab persistence as well as high intensity. (B) Association between individual HY-Ab and multiple recognitions. Overall P value was calculated by the Kruskal-Wallis test. **P < .01 and *P < .05 compared to SMCY by post-hoc test (the Steel-Dwass method).