These are substances that promote cell division.
Many act locally as autocrines or paracrines

  • Epidermal growth factor (EGF)
  • Platelet-derived growth factor (PDGF)
  • Fibroblast growth factor (FGF)
  • Nerve growth factor (NGF)
  • Tumor angiogenesis factors (TAFs)
  • Insulin-like growth factor (IGF)
  • Cytokines