diff --git a/rtd_phosphonetx/source/java/ch/systemsx/cisd/openbis/plugin/phosphonetx/client/web/client/application/Dict.java b/rtd_phosphonetx/source/java/ch/systemsx/cisd/openbis/plugin/phosphonetx/client/web/client/application/Dict.java
index c83f36f775a42a4f16b91341b31d4cb1f8d9174c..9902c36e13be2cbaad94a2ca1684b6a06710e851 100644
--- a/rtd_phosphonetx/source/java/ch/systemsx/cisd/openbis/plugin/phosphonetx/client/web/client/application/Dict.java
+++ b/rtd_phosphonetx/source/java/ch/systemsx/cisd/openbis/plugin/phosphonetx/client/web/client/application/Dict.java
@@ -51,6 +51,8 @@ public class Dict
     // Protein Viewer
     public static final String PROTEINS_SECTION = "proteins_section";
 
+    public static final String PRIMARY_PROTEIN = "primary_protein";
+    
     public static final String PROTEIN_IN_EXPERIMENT_TAB_LABEL = "protein_in_experiment_tab_label";
 
     public static final String EXPERIMENT_LABEL = "experiment_label";
@@ -97,4 +99,5 @@ public class Dict
     public static final String COPY_DATA_SETS_DATA_SET_TYPE_FIELD = "copy_data_sets_data_set_type_field";
 
 
+
 }
diff --git a/rtd_phosphonetx/source/java/ch/systemsx/cisd/openbis/plugin/phosphonetx/client/web/client/application/ProteinViewer.java b/rtd_phosphonetx/source/java/ch/systemsx/cisd/openbis/plugin/phosphonetx/client/web/client/application/ProteinViewer.java
index 79b8b1c394947bd325314d3740560ea98b354911..c9468c21e1a4e637a9f8c734e1f8aae432af0d00 100644
--- a/rtd_phosphonetx/source/java/ch/systemsx/cisd/openbis/plugin/phosphonetx/client/web/client/application/ProteinViewer.java
+++ b/rtd_phosphonetx/source/java/ch/systemsx/cisd/openbis/plugin/phosphonetx/client/web/client/application/ProteinViewer.java
@@ -169,12 +169,12 @@ public class ProteinViewer extends AbstractViewer<IEntityInformationHolder> impl
             recreateUIWithDatasetTable(protein, propertyPanel);
         } else
         {
-            List<IndistinguishableProteinInfo> indistinguishableProteins =
-                    details.getIndistinguishableProteinInfos();
-            LayoutContainer southPanel = new LayoutContainer();
-            RowLayoutManager rowDataManager = new RowLayoutManager(southPanel, new RowLayout());
-            add(southPanel, createBorderLayoutData(LayoutRegion.CENTER));
+            LayoutContainer centerPanel = new LayoutContainer();
+            RowLayoutManager rowDataManager = new RowLayoutManager(centerPanel, new RowLayout());
+            add(centerPanel, createBorderLayoutData(LayoutRegion.CENTER));
             rowDataManager.addToContainer(propertyPanel, new RowData(1, 0.5f));
+            List<IndistinguishableProteinInfo> indistinguishableProteins =
+                details.getIndistinguishableProteinInfos();
             if (indistinguishableProteins.isEmpty() == false)
             {
                 List<Peptide> peptides = details.getPeptides();
@@ -259,6 +259,7 @@ public class ProteinViewer extends AbstractViewer<IEntityInformationHolder> impl
     {
         PropertyGrid propertyGrid = createPropertyGrid(protein);
         ContentPanel contentPanel = new ContentPanel();
+        contentPanel.setHeading(viewContext.getMessage(Dict.PRIMARY_PROTEIN));
         contentPanel.setScrollMode(Scroll.AUTO);
         contentPanel.setCollapsible(true);
         contentPanel.add(propertyGrid);
diff --git a/rtd_phosphonetx/source/java/ch/systemsx/cisd/openbis/plugin/phosphonetx/client/web/public/phosphonetx-dictionary.js b/rtd_phosphonetx/source/java/ch/systemsx/cisd/openbis/plugin/phosphonetx/client/web/public/phosphonetx-dictionary.js
index 53eceb32476282ecc6e284a6f717f99070e78b2f..0c634318f3bd93dca3c8da65299769083f1f0e2d 100644
--- a/rtd_phosphonetx/source/java/ch/systemsx/cisd/openbis/plugin/phosphonetx/client/web/public/phosphonetx-dictionary.js
+++ b/rtd_phosphonetx/source/java/ch/systemsx/cisd/openbis/plugin/phosphonetx/client/web/public/phosphonetx-dictionary.js
@@ -22,6 +22,7 @@ var phosphonetx = {
   protein_browser: "Proteins",
   protein_summary: "Protein/Peptide Counts",
   database_name_and_version: "Database",
+  primary_protein: "Primary Protein and Peptides",
   indistinguishable_proteins: "Indistinguishable Proteins",
   sequence: "Amino Acid Sequence",
   sequences: "Amino Acid Sequences",