Queried GO terms:

  idGO:0002046   Detailed information
  nameopsin binding
  namespacemolecular_function
  def"Interacting selectively and non-covalently with an opsin, any of a group of hydrophobic, integral membrane glycoproteins located primarily in the disc membrane of rods or cones, involved in photoreception." [GOC:hjd]
  is_aGO:0005515 ! protein binding

No monarch genes has this GO term.