GLI1 and Patent ductus arteriosus: This signature assigned 38 human PDA cell lines as EMT high or low (Gröger et al., 2012; Viswanathan et al., 2017), and we found that GLI activity (see Figure 1B) correlated positively with EMT in our PDA cell line panel (Figure 2B), while SHH expression correlated negatively (Figure 2C).