IL37 and necrotizing enterocolitis: To further explore IL-37 in human NEC with a particular focus on immune cells by flow cytometry (gating in Supplementary Fig. 8), we analyzed blood samples from a separate second cohort of 21 infants born between 24 and 29 weeks of gestational age (patient characteristics in Supplementary Table 2), from whom blood was taken at birth, on day 1, in weeks 1 and 2 and at 36 weeks corrected gestational age; 27 healthy term infants (17 sampled at birth, 10 at 4−16 weeks of age) and 5 adults served as controls.