code: function cloneNode (n) {
      var c = {
          __association_score: n.__association_score,
          __evidence_count: n.__evidence_count,
          id: n.id,
          __id: n.__id,
          __name: n.__name,
          target: {
              id: n.target.id,
              name: n.target.gene_info.name,
              symbol: n.target.gene_info.symbol
          },
          disease: cloneDisease(n.disease),
          association_score: cloneAssociationScore(n.association_score),
          evidence_count: cloneEvidenceCount(n.evidence_count)
      };
      if (n.is_direct) {
          c.is_direct = n.is_direct;
      }
      return c;
  }
docs: Fast clone methods