fix syntax

app.py

@@ -104,14 +104,13 @@ node_info = pd.DataFrame({
 neighbors = neighbors.merge(
     right = node_info,
     left_on = "gene_id_1",
-    right_on = "gene_id",
-    suffixes = ("", "_1"))
+    right_on = "gene_id")
 
 neighbors = neighbors.merge(
     right = node_info,
     left_on = "gene_id_2",
     right_on = "gene_id",
-    suffixes = ("", "_2"))
+    suffixes = ("_a", "_b"))
 
 ################################
 # Use NetworkX to layout graph #