Fig. 3From: Potential Osteoinductive Effects of Hydroxyapatite Nanoparticles on Mesenchymal Stem Cells by Endothelial Cell InteractionIndirect toxicity of HAPs toward hWJ-MSCs. The viability of hWJ-MSCs indirectly cultured with HAPs was measured for a 24 and b 72 h. *P < 0.05; **P < 0.01 versus the control. The control group consisted of cells incubated in CM without HAPs treatment, and cell viability was normalized as a percentage of the control. Abbreviations: HAPs hydroxyapatite particles, m-HAP micro-sized HAP particles, hWJ-MSCs human umbilical cord Wharton’s jelly-derived mesenchymal stem cellsBack to article page