Allogeneic lymphocyte stimulation reaction of UCX® and UCX®-ATMP. Peripheral blood mononucleated cells (PBMCs) of donor 1 (filled bars) and donor 2 (open bars) were co-cultivated with PMBCs, UCX® and UCX®-ATMP at high (P15) and low (P5) passage (HP and LP). Proliferation was measured through a [3H]thymidine incorporation assay and results are expressed in counts per minute (CPM). Basal proliferation level is marked at approximately 5,000 CPM. Results are represented as mean ± SEM.