title: Signal-regulatory protein
text: # Signal-regulatory protein
  
  A Signal-regulatory protein (SIRP) is one of a family of transmembrane glycoproteins involved in immunological signalling, expressed mainly by myeloid cells.
  
  Members include :
  
  * Signal-regulatory protein alpha, ligand=CD47
  * SIRPB1
  * SIRPD
  * SIRPG, ligand=CD47
  