PECAM1 and chorioamnionitis: In addition, preterm infants with stage 3 chorioamnionitis compared to no chorioamnionitis had a significantly lower percentage of CD31+ Tregs (60.15±8.4% vs. 70.3±8.5%, p = 0.028) (Figure 6A) and a significantly higher percentage of CD31− Tregs (38.3±7.5% vs. 28.8±7.9%, p = 0.033) (Figure 6B).