Fig. 5From: The protective effects of PI3K/Akt pathway on human nucleus pulposus mesenchymal stem cells against hypoxia and nutrition deficiencyThe caspase 3 activity of hNP-MSCs cultured in normal condition (group 1), hypoxia and nutrition deficiency condition (group 2), the LY294002 condition (group 3), and the IGF-1 condition (group 4) evaluated by Ac-DEVD-pNA. *p < 0.05 indicated significant difference between groupsBack to article page