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HT-29 incubated for 2 days with (a) media only (no particles or drug), (b) particles only unexposed to UV, (c) irinotecan-loaded particles (10% by weight) unexposed to UV, (d) irinotecan-loaded particles (10% by weight) previously exposed to 20 min of UV, and (e) soluble irinotecan (no particles) at the theoretical maximal release concentration. (f) Specific absorbance from XTT assay.
