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Two-photon fluorescence confocal images of the CSCs and non-CSCs after incubation with SV119-PEG-AuNCs with different densities of SV119 for 3 h. The CSCs (ALDHhi population) and non-CSCs (ALDHlow population) derived from the mammospheres were labeled using the ALDEFLUOR kit and separately collected using the BD FACSAria III cell sorter. The green color represents the photoluminescence from the AuNCs.
