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Graph showing the variation of CTFR stain index at two-time points, day 0 and day 15 post-staining. To monitor the stability of CTFR, labeled erythrocytes were co-incubated with unlabeled erythrocytes for at least 24 h prior to data acquisition by flow cytometry. CTFR SI was monitored for 15 days and compared to that of CFDA-SE and DDAO-SE.
