MRC1 and Patent ductus arteriosus: As indicated in Figure 5B, the regenerative tissue of the C15G85-PDA group was associated with more CD206+ cells and fewer iNOS+ cells, and a CD206+ cells were aggregating band formed around the PDA interface of the columns, while the regenerative tissues of the C15G85, C0G100-PDA and C30G70-PDA groups were associated with fewer CD206+ cells and more iNOS+ cells, especially the C15G85 group.