Fig. 2

Quantification and validation of VEGF secreted by phBMMSCs. a VEGF levels in the CM from twenty six batches of phBMMSCs by ELISA. VEGF level at 48 h was 1.7 ± 0.7 ng/ml/million cells and at 72 h was 2.8 ± 1.0 ng/ml/million cells. b Quantification of VEGF levels in the CM from ten batches of phBMMSCs estimated by two different operators; no significant differences were observed in the VEGF levels estimated by two different operators determined by Student’s t test, p = 0.774. c Quantification of VEGF levels in the CM from ten batches of phBMMSCs estimated by a single operator on two different days; no significant differences were observed in the VEGF levels estimated by a single operator at different time points as determined by Student’s t test, p = 0.631. Data presented as mean ± SEM. SEMs shown as error bars. VEGF vascular endothelial growth factor