code: def neurommsig_gene_ora(graph: BELGraph, genes: List[Gene]) -> float:
      
      graph_genes = set(get_nodes_by_function(graph, GENE))
      return len(graph_genes.intersection(genes)) / len(graph_genes)
docs: Calculate the percentage of target genes mappable to the graph.
      
      Assume: graph central dogma inferred, collapsed to genes, collapsed variants