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Recovery of GBM 10 and GBM12 cells metabolic activity (MTT) within GelMA/HAMA hydrogel gradients after 4 days in fresh media (a), results are compared with MTT after 3 days in erlotinib (1st dose). (b) MTT after second dose of erlotinib (day 10) compared with metabolic activity recovery (day 7). MTT results are normalized to control for every erlotinib dose. *P < 0.05 compared with section 1.
