title: Contactin
text: # Contactin
  
  Contactins are a subgroup of molecules belonging to the immunoglobulin superfamily that are expressed exclusively in the nervous system. These proteins are attached to the neuronal membrane by a GPI-anchor. The subgroup consists of six members now referred to as contactin 1-6, but historically they had different names as shown in the table below:
  
  | New name | Old name |
  | - | - |
  | Contactin 1 | Contactin |
  | Contactin 2 | TAG-1 |
  | Contactin 3 | BIG-1 |
  | Contactin 4 | BIG-2 |
  | Contactin 5 | NB-2 |
  | Contactin 6 | NB-3 |
  