Nervous System Development | Pathways in Cancer | Herpes Simplex Virus 1 Infection | Signaling by Receptor Tyrosine Kinases | Signaling by Interleukins | Diseases of Signal Transduction by Growth Factor Receptors and Second Messengers | PI3K-Akt Signaling Pathway | Human Papillomavirus Infection | MicroRNAs in Cancer. Here, NTRK1 is linked to human papilloma virus infection.