diff --git a/src/ui/parcellationRegion/region.base.spec.ts b/src/ui/parcellationRegion/region.base.spec.ts
index a89baf7b08a98e0260ab68387055e84579c94188..e70c0f3b99b57ce573f7e3cd96b0a1dcf9e474b8 100644
--- a/src/ui/parcellationRegion/region.base.spec.ts
+++ b/src/ui/parcellationRegion/region.base.spec.ts
@@ -166,6 +166,7 @@ const getRegionInOtherTemplateSelectorBundle = (version: EnumParcRegVersion) =>
         mp1h,
         mr0lh,
         mt3,
+        mr0,
         mr0rh
       }
 
@@ -316,6 +317,7 @@ const getRegionInOtherTemplateSelectorBundle = (version: EnumParcRegVersion) =>
         mp1h,
         mr0lh,
         mt3,
+        mr0,
         mr0rh
       }
     }
@@ -329,13 +331,13 @@ describe('> region.base.ts', () => {
     for (const enumKey of Object.keys(EnumParcRegVersion)) {
       describe(`> selector version for ${enumKey}`, () => {
 
-        const { mockFetchedTemplates, mt2, mt0, mp0, mt1, mp1h, mr0lh, mt3, mr0rh } = getRegionInOtherTemplateSelectorBundle(enumKey as EnumParcRegVersion)
+        const { mockFetchedTemplates, mr0, mt2, mt0, mp0, mt1, mp1h, mr0lh, mt3, mr0rh } = getRegionInOtherTemplateSelectorBundle(enumKey as EnumParcRegVersion)
 
         describe('> no hemisphere selected, simulates big brain cyto map', () => {
   
           let result: any[]
           beforeAll(() => {
-            result = regionInOtherTemplateSelector.projector({ fetchedTemplates: mockFetchedTemplates, templateSelected: mt0 }, { region: mr0 })
+            result = regionInOtherTemplateSelector.projector(mockFetchedTemplates, mt0, { region: mr0 })
           })
     
           it('> length checks out', () => {
@@ -407,7 +409,7 @@ describe('> region.base.ts', () => {
         describe('> hemisphere data selected (left hemisphere), simulates julich-brain in mni152', () => {
           let result
           beforeAll(() => {
-            result = regionInOtherTemplateSelector.projector({ fetchedTemplates: mockFetchedTemplates, templateSelected: mt2 }, { region: mr0lh })
+            result = regionInOtherTemplateSelector.projector(mockFetchedTemplates, mt2, { region: mr0lh })
           })
     
           it('> length checks out', () => {
diff --git a/src/ui/parcellationRegion/region.base.ts b/src/ui/parcellationRegion/region.base.ts
index 55befb6065a25328471d053ccffc60a1dc71887b..7a79f88aa84c12810f52f5c32d5f9a917f776abc 100644
--- a/src/ui/parcellationRegion/region.base.ts
+++ b/src/ui/parcellationRegion/region.base.ts
@@ -90,7 +90,10 @@ export class RegionBase {
           const filteredRsInOtherTmpls = []
           for (const bundledObj of regionsInOtherTemplates) {
             const { template, parcellation, region } = bundledObj
-            const idx = filteredRsInOtherTmpls.findIndex(({ template: _template }) => _template['@id'] === template['@id'])
+            const idx = filteredRsInOtherTmpls.findIndex(({ template: _template, region: _region }) => {
+              return _template['@id'] === template['@id']
+                && getRegionHemisphere(_region) !== getRegionHemisphere(region)
+            })
             if ( idx < 0 ) {
               filteredRsInOtherTmpls.push(bundledObj)
             } else {
@@ -254,11 +257,7 @@ export const regionInOtherTemplateSelector = createSelector(
     const returnArr = []
     // const regionOfInterestHemisphere = regionOfInterest.status
 
-    const regionOfInterestHemisphere = (regionOfInterest.name.includes('- right hemisphere') || (!!regionOfInterest.status && regionOfInterest.status.includes('right hemisphere')))
-      ? EnumHemisphere.RIGHT_HEMISPHERE
-      : (regionOfInterest.name.includes('- left hemisphere') || (!!regionOfInterest.status && regionOfInterest.status.includes('left hemisphere')))
-        ? EnumHemisphere.LEFT_HEMISPHERE
-        : null
+    const regionOfInterestHemisphere = getRegionHemisphere(regionOfInterest)
 
     const regionOfInterestId = getIdFromFullId(regionOfInterest.fullId)
     if (!templateSelected) return []
@@ -271,35 +270,29 @@ export const regionInOtherTemplateSelector = createSelector(
 
         for (const region of selectableRegions) {
           const id = getIdFromFullId(region.fullId)
-          if (!!id) {
-            const regionHemisphere = (region.name.includes('- right hemisphere') || (!!region.status && region.status.includes('right hemisphere')))
-              ? EnumHemisphere.RIGHT_HEMISPHERE
-              : (region.name.includes('- left hemisphere') || (!!region.status && region.status.includes('left hemisphere')))
-                ? EnumHemisphere.LEFT_HEMISPHERE
-                : null
-            if (id === regionOfInterestId) {
-              /**
-               * if both hemisphere metadatas are defined
-               */
-              if (
-                !!regionOfInterestHemisphere &&
-                !!regionHemisphere
-              ) {
-                if (regionHemisphere === regionOfInterestHemisphere) {
-                  returnArr.push({
-                    template,
-                    parcellation,
-                    region,
-                  })
-                }
-              } else {
+          if (!!id && id === regionOfInterestId) {
+            const regionHemisphere = getRegionHemisphere(region)
+            /**
+             * if both hemisphere metadatas are defined
+             */
+            if (
+              !!regionOfInterestHemisphere &&
+              !!regionHemisphere
+            ) {
+              if (regionHemisphere === regionOfInterestHemisphere) {
                 returnArr.push({
                   template,
                   parcellation,
                   region,
-                  hemisphere: regionHemisphere
                 })
               }
+            } else {
+              returnArr.push({
+                template,
+                parcellation,
+                region,
+                hemisphere: regionHemisphere
+              })
             }
           }
         }
@@ -308,3 +301,11 @@ export const regionInOtherTemplateSelector = createSelector(
     return returnArr
   }
 )
+
+export function getRegionHemisphere(region: any):EnumHemisphere{
+  return (region.name.includes('- right hemisphere') || (!!region.status && region.status.includes('right hemisphere')))
+    ? EnumHemisphere.RIGHT_HEMISPHERE
+    : (region.name.includes('- left hemisphere') || (!!region.status && region.status.includes('left hemisphere')))
+      ? EnumHemisphere.LEFT_HEMISPHERE
+      : null
+}
diff --git a/src/ui/parcellationRegion/regionMenu/regionMenu.component.spec.ts b/src/ui/parcellationRegion/regionMenu/regionMenu.component.spec.ts
index 3cf92bedded94d7222bbdf48813fb34f4d14d9ef..fceeb0c7046afe38195967825e12cbd82097dde2 100644
--- a/src/ui/parcellationRegion/regionMenu/regionMenu.component.spec.ts
+++ b/src/ui/parcellationRegion/regionMenu/regionMenu.component.spec.ts
@@ -9,6 +9,7 @@ import { ARIA_LABELS } from 'common/constants'
 import { By } from "@angular/platform-browser"
 import { Directive, Input } from "@angular/core"
 import { NoopAnimationsModule } from "@angular/platform-browser/animations"
+import { viewerStateGetSelectedAtlas } from "src/services/state/viewerState/selectors"
 
 const mt0 = {
   name: 'mt0'
@@ -113,6 +114,13 @@ describe('> regionMenu.component.ts', () => {
     })
     
     describe('> regionInOtherTemplatesTmpl', () => {
+      beforeEach(() => {
+        const mockStore = TestBed.inject(MockStore)
+        mockStore.overrideSelector(
+          viewerStateGetSelectedAtlas,
+          { parcellations: [] }
+        )
+      })
 
       it('> if selector returns empty array, data-available-in-tmpl-count == 0', () => {