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Characterization of PDX tumor spheroids BL0293 (A–F) and BL0808 (G–L) based on the evaluation of shape parameters (roundness, solidity, and sphericity index (SI)), size (Feret’s diameter), cell growth, and viability for 240 h of culture, starting from different cell-seeding densities. Data displayed as mean ± SD referring to one experiment with three technical replicates (wells) per condition (n = 3).
