Differential expression grouped according to biological function. The number of upregulated transcripts is depicted by the red columns while the number of downregulated transcripts is depicted by the green columns. A-B: 6 hours after birth, PA and FAPA group respectively. C-D: 96 hours after birth PA and FAPA group respectively. (PA: experimental group only subjected to perinatal asphyxia. FAPA: experimental group subjected to both fetal preconditioning and perinatal asphyxia).