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mRNAs of human NKG2D ligands MICA and MICB were present in tracheal aspirates collected from preterm infants mechanically ventilated for respiratory distress in the first week of life. RNA was prepared from the infant tracheal aspirate samples. MICA mRNA expression was higher than MICB mRNA expression (A). MICA mRNA expression positively correlated with median FiO2 required by each subject up until the day of sample collection (B), Pearson correlation.
