CTLA4 and necrotizing enterocolitis: We did not find differences in FOXP3 and CTLA4 gene expression levels between age-matched A-CTRL and A-NEC patients or between R-CTRL and R-NEC patients, but we noticed that R-NEC patients expressed higher FOXP3 and CTLA4 levels than both A-NEC-XBP1u and A-NEC-XBP1s patients.