code: def remove_highlight_nodes(graph: BELGraph, nodes: Optional[Iterable[BaseEntity]]=None) -> None:
      
      for node in graph if nodes is None else nodes:
          if is_node_highlighted(graph, node):
              del graph.node[node][NODE_HIGHLIGHT]
docs: Removes the highlight from the given nodes, or all nodes if none given.
  
      :param graph: A BEL graph
      :param nodes: The list of nodes to un-highlight