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Representative 3D spheroids of PUM cells seeded at 2000, 4000, 8000, and 16,000 cells per well at days 3, 6 and 9 with corresponding spheroid cross-sectional area measurements (4× magnification; n = 3). PUM cells (A) S121, (B) S104, (C) S093, (D) S143, (E) S084, and (F) S119. Data are mean ± SD.
