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Normalized proliferation results of primary human CD4+ T cells cultured in suspension (positive control), large nonprinted PEG–heparin hydrogels (10x N.P), and large 3D printed PEG–heparin hydrogels (10x 3D P) 6 days after seeding: A) replication, B) expansion, and C) proliferation indexes (Ndonors = 5). The Mann–Whitney U test was used to assess statistical significance (*p < 0.05 and **p < 0.01).
