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Detection of sensitivity and stability of PbS QDs labeled ADSCs in vivo. (A,D,G,J) NIR-II imaging of PbS QDs labeled ADSCs (1 × 105, 5 × 104, 5 × 103, and 5 × 102 cells) and PBS in vivo in a time course (0, 7, 14, and 21 d post-injection). (B,E,H,K) PL intensity measured from (A,D,G,J). (C,F,I,L) Fluorescence area measured from (A,D,G,J). (M) Longitudinal comparison of PL intensity measured from (A,D,G,J). (N) Longitudinal comparison of fluorescence area measured from (A,D,G,J).
