Fig. 2

Long-term tracking of ADSCs or SDSCs in rat joints. A fNP-labeled ADSCs or SDSCs residing in the knee joint with NIR-II imaging during 0–12 weeks. B quantification of the fluorescence intensity of fNP-labeled ADSCs or SDSCs in the knee joint. C confocal microscopy of fNP labeled ADSCs or SDSCs in knee at 12 weeks, fNP only at 4 weeks, and zoomed-in images of regions in synovial membrane, meniscus and cartilage. (All data were shown as the mean ± SD. n = 3)