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Flow cytometry analysis of rhodamine B and RITC-chitosan uptake after 4 h (A–D) or 24 h (E–H) of culture in 10% FBS, for 4 structurally distinct chitosans (as indicated), and mean RFU values from N = 3 to 5 distinct experiments (I). For A–H: Black peak: unlabeled cells; white peak: rhoB-labeled; grey peak: RITC-chitosan-labeled.
