diff --git a/src/mol-model/loci.ts b/src/mol-model/loci.ts
index 6bc2d08de6d013bd7946df8d27fdd6505870fe70..abdd4824ddfb8b200375bd82d2bb762da8bf5955 100644
--- a/src/mol-model/loci.ts
+++ b/src/mol-model/loci.ts
@@ -11,6 +11,7 @@ import { Sphere3D } from 'mol-math/geometry';
 import { CentroidHelper } from 'mol-math/geometry/centroid-helper';
 import { Vec3 } from 'mol-math/linear-algebra';
 import { OrderedSet } from 'mol-data/int';
+import { Structure } from './structure/structure';
 
 /** A Loci that includes every loci */
 export const EveryLoci = { kind: 'every-loci' as 'every-loci' }
@@ -29,6 +30,9 @@ export function isEmptyLoci(x: any): x is EmptyLoci {
 export function areLociEqual(lociA: Loci, lociB: Loci) {
     if (isEveryLoci(lociA) && isEveryLoci(lociB)) return true
     if (isEmptyLoci(lociA) && isEmptyLoci(lociB)) return true
+    if (Structure.isLoci(lociA) && Structure.isLoci(lociB)) {
+        return Structure.areLociEqual(lociA, lociB)
+    }
     if (StructureElement.isLoci(lociA) && StructureElement.isLoci(lociB)) {
         return StructureElement.areLociEqual(lociA, lociB)
     }
@@ -44,7 +48,7 @@ export function areLociEqual(lociA: Loci, lociB: Loci) {
 
 export { Loci }
 
-type Loci = StructureElement.Loci | Link.Loci | EveryLoci | EmptyLoci | Shape.Loci
+type Loci = StructureElement.Loci | Structure.Loci | Link.Loci | EveryLoci | EmptyLoci | Shape.Loci
 
 namespace Loci {
 
@@ -54,7 +58,9 @@ namespace Loci {
         if (loci.kind === 'every-loci' || loci.kind === 'empty-loci') return void 0;
 
         sphereHelper.reset();
-        if (loci.kind === 'element-loci') {
+        if (loci.kind === 'structure-loci') {
+            return Sphere3D.clone(loci.structure.boundary.sphere)
+        } else if (loci.kind === 'element-loci') {
             for (const e of loci.elements) {
                 const { indices } = e;
                 const pos = e.unit.conformation.position;
diff --git a/src/mol-model/structure/structure/structure.ts b/src/mol-model/structure/structure/structure.ts
index 6eaa79bb0443d51334860fc4870cb43b359e0053..cab555fd9d249bf85d853329843356c6c3658d3b 100644
--- a/src/mol-model/structure/structure/structure.ts
+++ b/src/mol-model/structure/structure/structure.ts
@@ -280,6 +280,23 @@ function getUniqueAtomicResidueIndices(structure: Structure): ReadonlyMap<UUID,
 namespace Structure {
     export const Empty = new Structure([]);
 
+    /** Represents a single structure */
+    export interface Loci {
+        readonly kind: 'structure-loci',
+        readonly structure: Structure,
+    }
+    export function Loci(structure: Structure): Loci {
+        return { kind: 'structure-loci', structure };
+    }
+
+    export function isLoci(x: any): x is Loci {
+        return !!x && x.kind === 'structure-loci';
+    }
+
+    export function areLociEqual(a: Loci, b: Loci) {
+        return a.structure === b.structure
+    }
+
     export function create(units: ReadonlyArray<Unit>): Structure { return new Structure(units); }
 
     /**
diff --git a/src/mol-theme/label.ts b/src/mol-theme/label.ts
index 6cfaafb2316802c9ec76a0ed9b24f06466b5d54f..0e961fca8c17953d53ebed5f0a74fa00261176f0 100644
--- a/src/mol-theme/label.ts
+++ b/src/mol-theme/label.ts
@@ -20,6 +20,8 @@ function setElementLocation(loc: StructureElement, unit: Unit, index: StructureE
 
 export function labelFirst(loci: Loci): string {
     switch (loci.kind) {
+        case 'structure-loci':
+            return loci.structure.models.map(m => m.label).join(', ')
         case 'element-loci':
             const e = loci.elements[0]
             if (e) {