neurotrophins

see also:

• nerve growth factor (NGF) - binds TrkA receptor
• brain-derived neurotrophic factor (BDNF) - binds TrkB and p75 receptors
• Neurotrophin-3 (NT-3) - binds TrkC receptor as well as TrkA, TrkB to a lesser extent
• Neurotrophin-4 (NT-4)