Fig. 1From: Hypoxia preconditioning promotes cardiac stem cell survival and cardiogenic differentiation in vitro involving activation of the HIF-1α/apelin/APJ axisCSCs proliferation at different time points after hypoxia exposure. a CSCs proliferation rate tested by MTS. b Detection of the proliferation rate at different time points. Proliferation rate = OD (optical density) values at other time points divided by OD value at the beginning (same sample) × 100%. **p < 0.01 vs normoxiaBack to article page