Fig. 1

a Representative blots. b Expression levels of ACE2 and TMPRSS2 relative to GAPDH in protein homogenates from human lung, primary human bronchial epithelial cells (HBEpC), human pulmonary alveolar type 1 cells (AT1), transfected hUC-MSCs and hUC-MSCs. hUC-MSCs had significantly lower expression of ACE2 (p = 0.002) and TMPRSS2 (p = 0.008) compared to lung homogenates. The coefficient of variance for lung tissue was 46.9% and 52.3% for for hUC-MSC