Moreover, the expression of eight DEPs (PECAM1, PGLYRP1, AHCY, BHMT, EML3, ICOSLG, IGHV3‐23 and RTN4RL2) in normal and pneumonia groups (two patients) was quite different from that in the KD group (Fig. 4C). Here, RTN4RL2 is linked to susceptibility to pneumonia measurement.