diff --git a/server/controllers/importers/sif.js b/server/controllers/importers/sif.js
index 002046c9..5ef130b8 100644
--- a/server/controllers/importers/sif.js
+++ b/server/controllers/importers/sif.js
@@ -64,7 +64,18 @@ module.exports = function (sif) {
 
         var hasNumbers = relationships.some(isNumber);
         var allNumbers = relationships.every(isNumber);
+
+        let networkMode = "grn";
+        for (const relationship of relationships) {
+            if (relationship === "pp") {
+                networkMode = "protein-protein-physical-interaction";
+                break;
+            } else if (relationship === "pd") {
+                break;
+            }
+        }
         return {
+            networkMode: networkMode,
             sheetType: allNumbers ? constants.WEIGHTED : constants.UNWEIGHTED,
             warnings: hasNumbers && !allNumbers ? constants.warnings.EDGES_WITHOUT_WEIGHTS : null,
             errors: errors
@@ -134,6 +145,7 @@ module.exports = function (sif) {
         errors: errors,
         warnings: warnings,
         sheetType: workbookType.sheetType,
+        networkMode: workbookType.networkMode,
         positiveWeights: [],
         negativeWeights: [],
         meta: {},
diff --git a/test/import-sif-tests.js b/test/import-sif-tests.js
index 2d1759db..cd5911e1 100644
--- a/test/import-sif-tests.js
+++ b/test/import-sif-tests.js
@@ -27,7 +27,8 @@ var expectedUnweightedWorkbook = initWorkbook({
     negativeWeights: [],
     sheetType: "unweighted",
     meta: {},
-    expression:{}
+    expression:{},
+    networkMode: "grn"
 });
 
 var expectedWeightedWorkbook = initWorkbook({
@@ -50,6 +51,7 @@ var expectedWeightedWorkbook = initWorkbook({
     negativeWeights: [],
     sheetType: "weighted",
     meta: {},
+    networkMode: "grn",
     expression:{}
 });
 
@@ -76,7 +78,8 @@ var expectedUnweightedWorkbookWithCycle = initWorkbook({
     negativeWeights: [],
     sheetType: "unweighted",
     meta: {},
-    expression:{}
+    expression:{},
+    networkMode: "grn"
 });
 
 var expectedWeightedWorkbookWithCycle = initWorkbook({
@@ -102,7 +105,8 @@ var expectedWeightedWorkbookWithCycle = initWorkbook({
     negativeWeights: [],
     sheetType: "weighted",
     meta: {},
-    expression:{}
+    expression:{},
+    networkMode: "grn"
 });
 
 // Unweighted SIF
@@ -350,7 +354,8 @@ describe("Import from SIF", function () {
             negativeWeights: [],
             sheetType: "unweighted",
             meta: {},
-            expression:{}
+            expression:{},
+            networkMode: "grn"
         }));
     });
 
@@ -368,7 +373,8 @@ describe("Import from SIF", function () {
             negativeWeights: [],
             sheetType: "weighted",
             meta: {},
-            expression:{}
+            expression:{},
+            networkMode: "grn"
         }));
     });
 
diff --git a/web-client/public/js/setup-load-and-import-handlers.js b/web-client/public/js/setup-load-and-import-handlers.js
index 7a7408c1..dfea2028 100644
--- a/web-client/public/js/setup-load-and-import-handlers.js
+++ b/web-client/public/js/setup-load-and-import-handlers.js
@@ -143,10 +143,15 @@ export const setupLoadAndImportHandlers = (grnState) => {
                         break;
                     }
                 }
-                // TODO 👆🏼 The back end will add a `networkType` property to this object.
-                //     The web app can then adjust various things based on that.
                 grnState.workbook = workbook;
-                grnState.mode = workbook.meta.data.workbookType;
+
+                if (grnState.name.includes(".sif")) {
+                    grnState.mode = workbook.networkMode;
+                } else if (grnState.name.includes(".graphml")) {
+                    grnState.mode = "grn";
+                } else {
+                    grnState.mode = workbook.meta.data.workbookType;
+                }
                 grnState.workbook.expressionNames = Object.keys(workbook.expression);
                 if (uploadRoute !== "upload") {
                     grnState.annotateLinks();