reset all cells on graph reset

src/reducers/cells.js

@@ -1,9 +1,11 @@
 // jshint esversion: 6
 const Cells = (
   state = {
-    cells: null,
+    cells: null /* world */,
     loading: null,
-    error: null
+    error: null,
+
+    allCells: null /* this comes from cells endpoint, this is universe */
   },
   action
 ) => {
@@ -17,13 +19,20 @@ const Cells = (
       return Object.assign({}, state, {
         error: null,
         loading: false,
-        cells: action.data
+        cells: action.data, // most recently loaded cells
+
+        /* Universe - initialize once */
+        allCells: state.allCells ? state.allCells : action.data
       });
     case "request cells error":
       return Object.assign({}, state, {
         loading: false,
         error: action.data
       });
+    case "reset graph":
+      return Object.assign({}, state, {
+        cells: state.allCells
+      });
     default:
       return state;
   }

src/reducers/controls.js

@@ -103,6 +103,7 @@ const Controls = (
     allGeneNames: null,
     allCells: null /* this comes from cells endpoint, this is universe */,
     allCellsMetadata: null /* this comes from cells endpoint, and is just the metadata for universe */,
+    allCellsMetadataMap: null,
 
     /* View / World - all cells currently being displayed.  May be a subset of Universe. */
     cellsMetadata: null,