These pathways included categories such as phospholipid metabolism (Glycerophospholipid biosynthesis), signaling by receptor tyrosine kinases (Signaling by ERBB2/4), gene expression (DNA Methylation and Transcriptional Repression Signaling), post-translational protein modification (Phosphorylation), and cell cycle regulation (Cell Cycle Control of Chromosomal Replication), all of which have been associated with influenza infection previously (70, –, 74). Here, NTRK1 is linked to influenza.