Fig. 1From: Regulation of intracellular transition metal ion level with a pH-sensitive inorganic nanocluster to improve therapeutic angiogenesis by enriching conditioned medium retrieved from human adipose derived stem cellsSchematic of ps-TNCs induced CM enhancement and therapeutic procedure. a Synthesis of ps-TNCs. b Release of Fe ions under low pH condition, which mimics hADSC endosomes. c Uptake of ps-TNCs through hADSCs endocytosis. d Therapeutic efficacy by in vivo enriched CM injectionBack to article page