*Orexins (-A and -B) are involved in a number of cognitive processes, including appetite, arousal, and reward, among many others.
*Neurohypophysial hormones:
**Arginine-vasopressin
**Oxytocin regulates social cognition (e.g., trust and pair-bonding) and modulates maternal behavior.
*Endogenous opioids:
**Dynorphins
**Endorphins
**Endomorphins
**Enkephalins
* Neurotrophic factors are biomolecules – nearly all of which are peptides or small proteins – that support the growth, survival, and differentiation of both developing and mature neurons. Examples of notable neurotrophic factors include:
** Insulin-like growth factor-1 (IGF-1)
** Glial cell line-derived neurotrophic factor (GDNF)
** Vascular endothelial growth factor (VEGF)
** Brain-derived neurotrophic factor (BDNF)
** Nerve growth factor
** Neurotrophin-3
** Neurotrophin-4
** Ephrins
** Neuregulins