docs: def orthologize(self, species_id: str) -> "BEL":
          """Orthologize BEL AST to given species_id
  
          Will return original entity (ns:value) if no ortholog found.
  
          Args:
              species_id (str): species id to convert genes/rna/proteins into
  
          Returns:
              BEL: returns self
          """
  
          if not self.ast:
              return self
  
          # Collect canonical/decanonical NSArg values
          if not self.ast.collected_orthologs:
              self = self.collect_orthologs([species_id])
  
          self.ast.species = set()
          self.ast = bel_utils.orthologize(self.ast, self, species_id)
  
          return self