Fetal VAP-1 supports lymphocyte binding to venules. The binding of adult PBLs (A) and cord blood lymphocytes (B-C) to fetal and adult gut and PLN sections in the presence of anti-VAP-1 or control mAb was determined using the frozen-section binding assay. The results are mean ± SEM of 3 independent assays. (D) Adhesion (mean ± SEM) of adult PBLs and cord blood lymphocytes (both from 2 donors) to vessels in 2 different 40-week livers was determined as in panels A-C. ^*P < .05; ^**P < .01.