text: The GDNF family receptor-α (GFRα) proteins are a group of co-receptors which form complexes with GDNF-family ligands (GFLs) to activate RET, the receptor of the GFLs. The GFRα co-receptors include the following:
  * GFRα1 – preference for GDNF
  * GFRα2 – preference for neurturin
  * GFRα3 – preference for artemin
  * GFRα4 – preference for persephin
  * GFRAL - receptor for GDF15