* Vg1 Family
* Activin Family
** Involved in embryogenesis and osteogenesis
** Regulate insulin and pituitary, gonadal, and hypothalamic hormones
** Nerve cell survival factors 
**3 Activins: Activin A, Activin B and Activin AB.
* Glial-Derived Neurotrophic Factor (GDNF)
** Needed for kidney and enteric neuron differentiation
* Müllerian Inhibitory Factor
** Involved in mammalian sex determination
* Nodal 
** Binds to Activin A Type 2B receptor
** Forms receptor complex with Activin A Type 1B receptor or with Activin A Type 1C receptor.
*Growth and differentiation factors (GDFs)