diff --git a/src/main/java/org/reactome/server/graph/domain/model/DatabaseObject.java b/src/main/java/org/reactome/server/graph/domain/model/DatabaseObject.java
index 139eb1c5..27ac34e9 100644
--- a/src/main/java/org/reactome/server/graph/domain/model/DatabaseObject.java
+++ b/src/main/java/org/reactome/server/graph/domain/model/DatabaseObject.java
@@ -1,24 +1,29 @@
 package org.reactome.server.graph.domain.model;
 
-import com.fasterxml.jackson.annotation.JsonIdentityInfo;
-import com.fasterxml.jackson.annotation.JsonIgnore;
-import com.fasterxml.jackson.annotation.ObjectIdGenerators;
+import java.io.Serializable;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.lang.reflect.ParameterizedType;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+import java.util.Objects;
+import java.util.SortedSet;
+import java.util.TreeSet;
+
 import org.reactome.server.graph.domain.annotations.ReactomeProperty;
 import org.reactome.server.graph.domain.annotations.ReactomeSchemaIgnore;
 import org.reactome.server.graph.domain.annotations.ReactomeTransient;
+import org.reactome.server.graph.domain.relationship.ModifiedList;
 import org.reactome.server.graph.domain.result.DatabaseObjectLike;
 import org.springframework.data.neo4j.core.schema.Id;
 import org.springframework.data.neo4j.core.schema.Node;
 import org.springframework.data.neo4j.core.schema.Relationship;
 import org.springframework.lang.NonNull;
 
-import java.io.Serializable;
-import java.lang.reflect.InvocationTargetException;
-import java.lang.reflect.Method;
-import java.lang.reflect.ParameterizedType;
-import java.util.ArrayList;
-import java.util.Collection;
-import java.util.Objects;
+import com.fasterxml.jackson.annotation.JsonIdentityInfo;
+import com.fasterxml.jackson.annotation.JsonIgnore;
+import com.fasterxml.jackson.annotation.ObjectIdGenerators;
 
 /**
  * DatabaseObject contains the minimum fields used to define an instance of an Reactome entry
@@ -62,13 +67,21 @@ public abstract class DatabaseObject implements Serializable, Comparable<Databas
 
     @Relationship(type = "modified", direction = Relationship.Direction.INCOMING)
     private InstanceEdit modified;
+    
+    // This is a list of InstanceEdits that have modified this DatabaseObject.
+    // So that we can track all modifications, not just the most recent one.
+    @Relationship(type = "modifiedList", direction = Relationship.Direction.INCOMING)
+    private SortedSet<ModifiedList> modifiedList;
+    
+    @Relationship(type = "stableIdentifier")
+    private StableIdentifier stableIdentifier;
 
     public DatabaseObject() {
     }
 
     public DatabaseObject(Long dbId) {
         this.dbId = dbId;
-    }
+    } 
 
 //    @ReactomeSchemaIgnore
 //    public Long getId() {
@@ -79,6 +92,40 @@ public DatabaseObject(Long dbId) {
 //        this.id = id;
 //    }
 
+    public StableIdentifier getStableIdentifier() {
+        return stableIdentifier;
+    }
+
+    public void setStableIdentifier(StableIdentifier stableIdentifier) {
+        this.stableIdentifier = stableIdentifier;
+    }
+
+    public List<InstanceEdit> getModifiedList() {
+        if (this.modifiedList == null || this.modifiedList.isEmpty()) {
+            return null;
+        }
+
+        List<InstanceEdit> rtn = new ArrayList<>();
+        for (ModifiedList modified : this.modifiedList) {
+            rtn.add(modified.getInstanceEdit());
+        }
+        return rtn;
+    }
+
+    public void setModifiedList(List<InstanceEdit> modifiedList) {
+        if (modifiedList == null || modifiedList.isEmpty()) {
+            return;
+        }   
+        this.modifiedList = new TreeSet<>();
+        int order = 0;
+        for (InstanceEdit instanceEdit : modifiedList) {
+            ModifiedList aux = new ModifiedList();
+            aux.setInstanceEdit(instanceEdit);
+            aux.setOrder(order++);
+            this.modifiedList.add(aux);
+        }
+    }
+
     public Long getDbId() {
         return dbId;
     }
diff --git a/src/main/java/org/reactome/server/graph/domain/model/Deleted.java b/src/main/java/org/reactome/server/graph/domain/model/Deleted.java
index dd4cadc5..afa66cea 100644
--- a/src/main/java/org/reactome/server/graph/domain/model/Deleted.java
+++ b/src/main/java/org/reactome/server/graph/domain/model/Deleted.java
@@ -26,6 +26,9 @@ public class Deleted extends MetaDatabaseObject{
     @Deprecated
     @ReactomeProperty(originName = "deletedInstanceDB_ID")
     private List<Integer> deletedInstanceDbId;
+    
+    @ReactomeProperty(originName = "replacementInstanceDB_IDs")
+    private List<Integer> replacementInstanceDbIds;
 
     public Deleted() {
     }
@@ -34,6 +37,14 @@ public String getCuratorComment() {
         return curatorComment;
     }
 
+    public List<Integer> getReplacementInstanceDbIds() {
+        return replacementInstanceDbIds;
+    }
+
+    public void setReplacementInstanceDbIds(List<Integer> replacementInstanceDbIds) {
+        this.replacementInstanceDbIds = replacementInstanceDbIds;
+    }
+
     public void setCuratorComment(String curatorComment) {
         this.curatorComment = curatorComment;
     }
diff --git a/src/main/java/org/reactome/server/graph/domain/model/Event.java b/src/main/java/org/reactome/server/graph/domain/model/Event.java
index ad8fca3f..3b8bb8f5 100644
--- a/src/main/java/org/reactome/server/graph/domain/model/Event.java
+++ b/src/main/java/org/reactome/server/graph/domain/model/Event.java
@@ -31,6 +31,8 @@ public abstract class Event extends DatabaseObject implements Trackable, Deletab
     private String releaseStatus;
     @ReactomeProperty(addedField = true)
     private String speciesName;
+    @ReactomeProperty(originName = "_doRelease")
+    private Boolean doRelease;
 
     @Relationship(type = "authored", direction = Relationship.Direction.INCOMING)
     private List<InstanceEdit> authored;
@@ -416,4 +418,13 @@ public List<UpdateTracker> getUpdateTrackers() {
     public void setUpdateTrackers(List<UpdateTracker> updateTrackers) {
         this.updateTrackers = updateTrackers;
     }
+    
+
+    public Boolean getDoRelease() {
+        return doRelease;
+    }
+
+    public void setDoRelease(Boolean doRelease) {
+        this.doRelease = doRelease;
+    }
 }
diff --git a/src/main/java/org/reactome/server/graph/domain/model/GO_BiologicalProcess.java b/src/main/java/org/reactome/server/graph/domain/model/GO_BiologicalProcess.java
index 4e794a73..10a715d4 100644
--- a/src/main/java/org/reactome/server/graph/domain/model/GO_BiologicalProcess.java
+++ b/src/main/java/org/reactome/server/graph/domain/model/GO_BiologicalProcess.java
@@ -4,7 +4,7 @@
 
 @SuppressWarnings("unused")
 @Node
-public class GO_BiologicalProcess extends GO_Term{
+public class GO_BiologicalProcess extends GO_Term {
 
     public GO_BiologicalProcess() {}
 
diff --git a/src/main/java/org/reactome/server/graph/domain/model/GO_CellularComponent.java b/src/main/java/org/reactome/server/graph/domain/model/GO_CellularComponent.java
index 74d69eb6..e947ccbd 100644
--- a/src/main/java/org/reactome/server/graph/domain/model/GO_CellularComponent.java
+++ b/src/main/java/org/reactome/server/graph/domain/model/GO_CellularComponent.java
@@ -43,13 +43,6 @@ public void setHasPart(List<GO_CellularComponent> hasPart) {
         this.hasPart = hasPart;
     }
 
-    public List<GO_CellularComponent> getInstanceOf() {
-        return instanceOf;
-    }
-
-    public void setInstanceOf(List<GO_CellularComponent> instanceOf) {
-        this.instanceOf = instanceOf;
-    }
 
     public List<GO_CellularComponent> getSurroundedBy() {
         return surroundedBy;
diff --git a/src/main/java/org/reactome/server/graph/domain/model/GO_Term.java b/src/main/java/org/reactome/server/graph/domain/model/GO_Term.java
index 1635ae26..4f777221 100644
--- a/src/main/java/org/reactome/server/graph/domain/model/GO_Term.java
+++ b/src/main/java/org/reactome/server/graph/domain/model/GO_Term.java
@@ -12,73 +12,14 @@
  */
 @SuppressWarnings("unused")
 @Node
-public abstract class GO_Term extends DatabaseObject{
-
-    @ReactomeProperty
-    private String accession;
-    // will be filled together with url
-    private String databaseName;
-    @ReactomeProperty
-    private String definition;
-    @ReactomeProperty
-    private String name;
-    @ReactomeProperty(addedField = true)
-    private String url;
-    @Relationship(type = "referenceDatabase")
-    private ReferenceDatabase referenceDatabase;
+public abstract class GO_Term extends ExternalOntology {
 
     public GO_Term() {}
-
+    
     public GO_Term(Long dbId) {
-        super(dbId);
-    }
-
-    public String getAccession() {
-        return accession;
+        super();
+        setDbId(dbId);
     }
 
-    public void setAccession(String accession) {
-        this.accession = accession;
-    }
-
-    public String getDatabaseName() {
-        return databaseName;
-    }
-
-    public void setDatabaseName(String databaseName) {
-        this.databaseName = databaseName;
-    }
-
-    public String getDefinition() {
-        return definition;
-    }
-
-    public void setDefinition(String definition) {
-        this.definition = definition;
-    }
-
-    public String getName() {
-        return name;
-    }
-
-    public void setName(String name) {
-        this.name = name;
-    }
-
-    public String getUrl() {
-        return url;
-    }
-
-    public void setUrl(String url) {
-        this.url = url;
-    }
-
-    public ReferenceDatabase getReferenceDatabase() {
-        return referenceDatabase;
-    }
-
-    public void setReferenceDatabase(ReferenceDatabase referenceDatabase) {
-        this.referenceDatabase = referenceDatabase;
-    }
 }
 
diff --git a/src/main/java/org/reactome/server/graph/domain/model/LiteratureReference.java b/src/main/java/org/reactome/server/graph/domain/model/LiteratureReference.java
index c7e2e9d8..37cfabec 100644
--- a/src/main/java/org/reactome/server/graph/domain/model/LiteratureReference.java
+++ b/src/main/java/org/reactome/server/graph/domain/model/LiteratureReference.java
@@ -2,6 +2,7 @@
 
 import org.reactome.server.graph.domain.annotations.ReactomeProperty;
 import org.springframework.data.neo4j.core.schema.Node;
+import org.springframework.data.neo4j.core.schema.Relationship;
 
 @SuppressWarnings("unused")
 @Node
@@ -19,9 +20,20 @@ public class LiteratureReference extends Publication {
     private Integer volume;
     @ReactomeProperty
     private Integer year;
+    
+    @Relationship(type = "retractionStatus")
+    private RetractionStatus retractionStatus;
 
     public LiteratureReference() {}
 
+    public RetractionStatus getRetractionStatus() {
+        return retractionStatus;
+    }
+
+    public void setRetractionStatus(RetractionStatus retractionStatus) {
+        this.retractionStatus = retractionStatus;
+    }
+
     public LiteratureReference(Long dbId) {
         super(dbId);
     }
diff --git a/src/main/java/org/reactome/server/graph/domain/model/PathwayDiagram.java b/src/main/java/org/reactome/server/graph/domain/model/PathwayDiagram.java
new file mode 100644
index 00000000..a630fc82
--- /dev/null
+++ b/src/main/java/org/reactome/server/graph/domain/model/PathwayDiagram.java
@@ -0,0 +1,68 @@
+package org.reactome.server.graph.domain.model;
+
+import java.util.List;
+
+import org.reactome.server.graph.domain.annotations.ReactomeProperty;
+import org.springframework.data.neo4j.core.schema.Node;
+import org.springframework.data.neo4j.core.schema.Relationship;
+
+@Node
+public class PathwayDiagram extends DatabaseObject {
+    
+    @Relationship(type = "representedPathway")
+    private List<Pathway> representedPathway;
+    @Relationship(type = "renderedInstance")
+    private List<DatabaseObject> renderedInstance;
+    
+    @ReactomeProperty(addedField = true)
+    private String jsonFile; // JSON representation of the pathway diagram
+    @ReactomeProperty
+    private int width; // Width of the diagram  
+    @ReactomeProperty
+    private int height; // Height of the diagram
+    
+    public int getWidth() {
+        return width;
+    }
+
+    public void setWidth(int width) {
+        this.width = width;
+    }
+
+    public int getHeight() {
+        return height;
+    }
+
+    public void setHeight(int height) {
+        this.height = height;
+    }
+
+    public PathwayDiagram() {
+        super();
+    }
+
+    public String getJsonFile() {
+        return jsonFile;
+    }
+
+    public void setJsonFile(String jsonFile) {
+        this.jsonFile = jsonFile;
+    }
+
+    public List<Pathway> getRepresentedPathway() {
+        return representedPathway;
+    }
+    
+    public void setRepresentedPathway(List<Pathway> representedPathway) {
+        this.representedPathway = representedPathway;
+    }
+
+    public List<DatabaseObject> getRenderedInstance() {
+        return renderedInstance;
+    }
+    
+    public void setRenderedInstance(List<DatabaseObject> renderedInstance) {
+        this.renderedInstance = renderedInstance;
+    }
+
+}
diff --git a/src/main/java/org/reactome/server/graph/domain/model/RetractionStatus.java b/src/main/java/org/reactome/server/graph/domain/model/RetractionStatus.java
new file mode 100644
index 00000000..a7db0759
--- /dev/null
+++ b/src/main/java/org/reactome/server/graph/domain/model/RetractionStatus.java
@@ -0,0 +1,12 @@
+package org.reactome.server.graph.domain.model;
+
+import org.springframework.data.neo4j.core.schema.Node;
+
+@Node
+public class RetractionStatus extends ControlledVocabulary {
+    
+    public RetractionStatus() {
+        
+    }
+
+}
diff --git a/src/main/java/org/reactome/server/graph/domain/model/StableIdentifier.java b/src/main/java/org/reactome/server/graph/domain/model/StableIdentifier.java
new file mode 100644
index 00000000..bc31998f
--- /dev/null
+++ b/src/main/java/org/reactome/server/graph/domain/model/StableIdentifier.java
@@ -0,0 +1,68 @@
+package org.reactome.server.graph.domain.model;
+
+import org.reactome.server.graph.domain.annotations.ReactomeProperty;
+import org.springframework.data.neo4j.core.schema.Node;
+
+@Node
+public class StableIdentifier extends DatabaseObject {
+
+    @ReactomeProperty
+    private String identifier;
+    @ReactomeProperty
+    private String identifierVersion;
+    @ReactomeProperty
+    private String oldIdentifier;
+    @ReactomeProperty
+    private String oldIdentifierVersion;
+    @ReactomeProperty
+    private Boolean released;
+    
+
+    public StableIdentifier() {}
+
+    public StableIdentifier(Long dbId) {
+        super(dbId);
+    }
+
+    public String getIdentifier() {
+        return identifier;
+    }
+
+    public void setIdentifier(String identifier) {
+        this.identifier = identifier;
+    }
+
+    public String getIdentifierVersion() {
+        return identifierVersion;
+    }
+
+    public void setIdentifierVersion(String identifierVersion) {
+        this.identifierVersion = identifierVersion;
+    }
+
+    public String getOldIdentifier() {
+        return oldIdentifier;
+    }
+
+    public void setOldIdentifier(String oldIdentifier) {
+        this.oldIdentifier = oldIdentifier;
+    }
+
+    public String getOldIdentifierVersion() {
+        return oldIdentifierVersion;
+    }
+
+    public void setOldIdentifierVersion(String oldIdentifierVersion) {
+        this.oldIdentifierVersion = oldIdentifierVersion;
+    }
+
+    public Boolean getReleased() {
+        return released;
+    }
+
+    public void setReleased(Boolean released) {
+        this.released = released;
+    }
+
+
+}
diff --git a/src/main/java/org/reactome/server/graph/domain/relationship/ModifiedList.java b/src/main/java/org/reactome/server/graph/domain/relationship/ModifiedList.java
new file mode 100644
index 00000000..a1839177
--- /dev/null
+++ b/src/main/java/org/reactome/server/graph/domain/relationship/ModifiedList.java
@@ -0,0 +1,61 @@
+package org.reactome.server.graph.domain.relationship;
+
+import java.util.Objects;
+
+import org.reactome.server.graph.domain.model.InstanceEdit;
+import org.springframework.data.neo4j.core.schema.GeneratedValue;
+import org.springframework.data.neo4j.core.schema.Id;
+import org.springframework.data.neo4j.core.schema.RelationshipProperties;
+import org.springframework.data.neo4j.core.schema.TargetNode;
+
+@RelationshipProperties
+public class ModifiedList implements Comparable<ModifiedList> {
+    @Id @GeneratedValue private Long id;
+    @TargetNode private InstanceEdit instanceEdit;
+
+    private int order;
+    
+    public ModifiedList() {}
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public InstanceEdit getInstanceEdit() {
+        return instanceEdit;
+    }
+
+    public void setInstanceEdit(InstanceEdit instanceEdit) {
+        this.instanceEdit = instanceEdit;
+    }
+
+    public int getOrder() {
+        return order;
+    }
+
+    public void setOrder(int order) {
+        this.order = order;
+    }
+    
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        return Objects.equals(instanceEdit, ((ModifiedList) o).instanceEdit);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(instanceEdit);
+    }
+
+    @Override
+    public int compareTo(ModifiedList o) {
+        return this.order - o.order;
+    }
+
+}