diff --git a/modules/common/app/edu/berkeley/ground/common/dao/core/NodeVersionDao.java b/modules/common/app/edu/berkeley/ground/common/dao/core/NodeVersionDao.java
index 9e0ac9aa..f0690e37 100644
--- a/modules/common/app/edu/berkeley/ground/common/dao/core/NodeVersionDao.java
+++ b/modules/common/app/edu/berkeley/ground/common/dao/core/NodeVersionDao.java
@@ -23,6 +23,8 @@ public interface NodeVersionDao extends RichVersionDao<NodeVersion> {
   @Override
   NodeVersion retrieveFromDatabase(long id) throws GroundException;
 
+  List<Long> retrieveAdjacentLineageEdgeVersion(long startId) throws GroundException;
+
   @Override
   default Class<NodeVersion> getType() {
     return NodeVersion.class;
diff --git a/modules/postgres/app/edu/berkeley/ground/postgres/controllers/NodeController.java b/modules/postgres/app/edu/berkeley/ground/postgres/controllers/NodeController.java
index fa6c2150..36985fbc 100644
--- a/modules/postgres/app/edu/berkeley/ground/postgres/controllers/NodeController.java
+++ b/modules/postgres/app/edu/berkeley/ground/postgres/controllers/NodeController.java
@@ -149,4 +149,22 @@ public final CompletionStage<Result> getHistory(String sourceKey) {
              .thenApply(Results::ok)
              .exceptionally(e -> GroundUtils.handleException(e, request()));
   }
+
+  public final CompletionStage<Result> getAdjacentLineage(Long id) {
+    return CompletableFuture.supplyAsync(
+      () -> {
+        try {
+          return this.cache.getOrElse(
+            "node_version_adj_lineage." + id,
+            () -> Json.toJson(this.postgresNodeVersionDao.retrieveAdjacentLineageEdgeVersion(id)),
+            Integer.parseInt(System.getProperty("ground.cache.expire.secs")));
+        } catch (Exception e) {
+          throw new CompletionException(e);
+        }
+      },
+      PostgresUtils.getDbSourceHttpContext(actorSystem))
+             .thenApply(Results::ok)
+             .exceptionally(e -> GroundUtils.handleException(e, request()));
+  }
+
 }
diff --git a/modules/postgres/app/edu/berkeley/ground/postgres/dao/SqlConstants.java b/modules/postgres/app/edu/berkeley/ground/postgres/dao/SqlConstants.java
index de777205..d36a2995 100644
--- a/modules/postgres/app/edu/berkeley/ground/postgres/dao/SqlConstants.java
+++ b/modules/postgres/app/edu/berkeley/ground/postgres/dao/SqlConstants.java
@@ -52,6 +52,7 @@ public class SqlConstants {
 
   /* Node-specific statements */
   public static final String INSERT_NODE_VERSION = "INSERT INTO node_version (id, node_id) VALUES (%d, %d);";
+  public static final String SELECT_NODE_VERSION_ADJACENT_LINEAGE = "SELECT * FROM lineage_edge_version WHERE from_rich_version_id = %d;";
 
   /* Rich Version-specific statements */
   public static final String INSERT_RICH_VERSION_WITH_REFERENCE = "INSERT INTO rich_version (id, structure_version_id, reference) VALUES (%d, %d, "
diff --git a/modules/postgres/app/edu/berkeley/ground/postgres/dao/core/PostgresNodeVersionDao.java b/modules/postgres/app/edu/berkeley/ground/postgres/dao/core/PostgresNodeVersionDao.java
index 0c8c3036..da144d33 100644
--- a/modules/postgres/app/edu/berkeley/ground/postgres/dao/core/PostgresNodeVersionDao.java
+++ b/modules/postgres/app/edu/berkeley/ground/postgres/dao/core/PostgresNodeVersionDao.java
@@ -10,6 +10,7 @@
 import edu.berkeley.ground.postgres.dao.SqlConstants;
 import edu.berkeley.ground.postgres.util.PostgresStatements;
 import edu.berkeley.ground.postgres.util.PostgresUtils;
+import java.util.ArrayList;
 import java.util.List;
 import play.db.Database;
 import play.libs.Json;
@@ -58,7 +59,7 @@ public PostgresStatements delete(long id) {
   @Override
   public NodeVersion retrieveFromDatabase(long id) throws GroundException {
     String sql = String.format(SqlConstants.SELECT_STAR_BY_ID, "node_version", id);
-    JsonNode json = Json.parse(PostgresUtils.executeQueryToJson(dbSource, sql));
+    JsonNode json = Json.parse(PostgresUtils.executeQueryToJson(this.dbSource, sql));
 
     if (json.size() == 0) {
       throw new GroundException(ExceptionType.VERSION_NOT_FOUND, this.getType().getSimpleName(), String.format("%d", id));
@@ -69,4 +70,15 @@ public NodeVersion retrieveFromDatabase(long id) throws GroundException {
 
     return new NodeVersion(id, richVersion, nodeVersion);
   }
+
+  @Override
+  public List<Long> retrieveAdjacentLineageEdgeVersion(long startId) throws GroundException {
+    String sql = String.format(SqlConstants.SELECT_NODE_VERSION_ADJACENT_LINEAGE, startId);
+    JsonNode json = Json.parse(PostgresUtils.executeQueryToJson(this.dbSource, sql));
+
+    List<Long> result = new ArrayList<>();
+    json.forEach(x -> result.add(x.get("id").asLong()));
+
+    return result;
+  }
 }
diff --git a/modules/postgres/conf/routes b/modules/postgres/conf/routes
index 1f94267f..ef6c7246 100644
--- a/modules/postgres/conf/routes
+++ b/modules/postgres/conf/routes
@@ -3,56 +3,57 @@
 # ~~~~
 
 # An example controller showing a sample home page
-GET         /                                         edu.berkeley.ground.postgres.controllers.HomeController.index
+GET         /                                           edu.berkeley.ground.postgres.controllers.HomeController.index
 
 # Map static resources from the /public folder to the /assets URL path
-GET         /assets/*file                             controllers.Assets.versioned(path="/public", file: Asset)
+GET         /assets/*file                               controllers.Assets.versioned(path="/public", file: Asset)
 
 # edge endpoints
-POST        /edges                                    edu.berkeley.ground.postgres.controllers.EdgeController.addEdge()
-GET         /edges/:sourceKey                         edu.berkeley.ground.postgres.controllers.EdgeController.getEdge(sourceKey: String)
-POST        /versions/edges                           edu.berkeley.ground.postgres.controllers.EdgeController.addEdgeVersion()
-GET         /versions/edges/:id                       edu.berkeley.ground.postgres.controllers.EdgeController.getEdgeVersion(id: Long)
-GET         /edges/:sourceKey/latest                  edu.berkeley.ground.postgres.controllers.EdgeController.getLatest(sourceKey: String)
-GET         /edges/:sourceKey/history                 edu.berkeley.ground.postgres.controllers.EdgeController.getHistory(sourceKey: String)
+POST        /edges                                      edu.berkeley.ground.postgres.controllers.EdgeController.addEdge()
+GET         /edges/:sourceKey                           edu.berkeley.ground.postgres.controllers.EdgeController.getEdge(sourceKey: String)
+POST        /versions/edges                             edu.berkeley.ground.postgres.controllers.EdgeController.addEdgeVersion()
+GET         /versions/edges/:id                         edu.berkeley.ground.postgres.controllers.EdgeController.getEdgeVersion(id: Long)
+GET         /edges/:sourceKey/latest                    edu.berkeley.ground.postgres.controllers.EdgeController.getLatest(sourceKey: String)
+GET         /edges/:sourceKey/history                   edu.berkeley.ground.postgres.controllers.EdgeController.getHistory(sourceKey: String)
 
 # graph endpoints
-POST        /graphs                                   edu.berkeley.ground.postgres.controllers.GraphController.addGraph()
-GET         /graphs/:sourceKey                        edu.berkeley.ground.postgres.controllers.GraphController.getGraph(sourceKey: String)
-POST        /versions/graphs                          edu.berkeley.ground.postgres.controllers.GraphController.addGraphVersion()
-GET         /versions/graphs/:id                      edu.berkeley.ground.postgres.controllers.GraphController.getGraphVersion(id: Long)
-GET         /graphs/:sourceKey/latest                 edu.berkeley.ground.postgres.controllers.GraphController.getLatest(sourceKey: String)
-GET         /graphs/:sourceKey/history                edu.berkeley.ground.postgres.controllers.GraphController.getHistory(sourceKey: String)
+POST        /graphs                                     edu.berkeley.ground.postgres.controllers.GraphController.addGraph()
+GET         /graphs/:sourceKey                          edu.berkeley.ground.postgres.controllers.GraphController.getGraph(sourceKey: String)
+POST        /versions/graphs                            edu.berkeley.ground.postgres.controllers.GraphController.addGraphVersion()
+GET         /versions/graphs/:id                        edu.berkeley.ground.postgres.controllers.GraphController.getGraphVersion(id: Long)
+GET         /graphs/:sourceKey/latest                   edu.berkeley.ground.postgres.controllers.GraphController.getLatest(sourceKey: String)
+GET         /graphs/:sourceKey/history                  edu.berkeley.ground.postgres.controllers.GraphController.getHistory(sourceKey: String)
 
 # lineage edge endpoints
-POST        /lineage_edges                            edu.berkeley.ground.postgres.controllers.LineageEdgeController.createLineageEdge()
-GET         /lineage_edges/:sourceKey                 edu.berkeley.ground.postgres.controllers.LineageEdgeController.getLineageEdge(sourceKey: String)
-POST        /versions/lineage_edges                   edu.berkeley.ground.postgres.controllers.LineageEdgeController.createLineageEdgeVersion()
-GET         /versions/lineage_edges/:id               edu.berkeley.ground.postgres.controllers.LineageEdgeController.getLineageEdgeVersion(id: Long)
-GET         /lineage_edges/:sourceKey/latest          edu.berkeley.ground.postgres.controllers.LineageEdgeController.getLatest(sourceKey: String)
-GET         /lineage_edges/:sourceKey/history         edu.berkeley.ground.postgres.controllers.LineageEdgeController.getHistory(sourceKey: String)
+POST        /lineage_edges                              edu.berkeley.ground.postgres.controllers.LineageEdgeController.createLineageEdge()
+GET         /lineage_edges/:sourceKey                   edu.berkeley.ground.postgres.controllers.LineageEdgeController.getLineageEdge(sourceKey: String)
+POST        /versions/lineage_edges                     edu.berkeley.ground.postgres.controllers.LineageEdgeController.createLineageEdgeVersion()
+GET         /versions/lineage_edges/:id                 edu.berkeley.ground.postgres.controllers.LineageEdgeController.getLineageEdgeVersion(id: Long)
+GET         /lineage_edges/:sourceKey/latest            edu.berkeley.ground.postgres.controllers.LineageEdgeController.getLatest(sourceKey: String)
+GET         /lineage_edges/:sourceKey/history           edu.berkeley.ground.postgres.controllers.LineageEdgeController.getHistory(sourceKey: String)
 
 # lineage graph endpoints
-POST        /lineage_graphs                           edu.berkeley.ground.postgres.controllers.LineageGraphController.createLineageGraph()
-GET         /lineage_graphs/:sourceKey                edu.berkeley.ground.postgres.controllers.LineageGraphController.getLineageGraph(sourceKey: String)
-POST        /versions/lineage_graphs                  edu.berkeley.ground.postgres.controllers.LineageGraphController.createLineageGraphVersion()
-GET         /versions/lineage_graphs/:id              edu.berkeley.ground.postgres.controllers.LineageGraphController.getLineageGraphVersion(id: Long)
-GET         /lineage_graphs/:sourceKey/latest         edu.berkeley.ground.postgres.controllers.LineageGraphController.getLatest(sourceKey: String)
-GET         /lineage_graphs/:sourceKey/history        edu.berkeley.ground.postgres.controllers.LineageGraphController.getHistory(sourceKey: String)
+POST        /lineage_graphs                             edu.berkeley.ground.postgres.controllers.LineageGraphController.createLineageGraph()
+GET         /lineage_graphs/:sourceKey                  edu.berkeley.ground.postgres.controllers.LineageGraphController.getLineageGraph(sourceKey: String)
+POST        /versions/lineage_graphs                    edu.berkeley.ground.postgres.controllers.LineageGraphController.createLineageGraphVersion()
+GET         /versions/lineage_graphs/:id                edu.berkeley.ground.postgres.controllers.LineageGraphController.getLineageGraphVersion(id: Long)
+GET         /lineage_graphs/:sourceKey/latest           edu.berkeley.ground.postgres.controllers.LineageGraphController.getLatest(sourceKey: String)
+GET         /lineage_graphs/:sourceKey/history          edu.berkeley.ground.postgres.controllers.LineageGraphController.getHistory(sourceKey: String)
 
 # node endpoints
-POST        /nodes                                    edu.berkeley.ground.postgres.controllers.NodeController.addNode()
-GET         /nodes/:sourceKey                         edu.berkeley.ground.postgres.controllers.NodeController.getNode(sourceKey: String)
-POST        /versions/nodes                           edu.berkeley.ground.postgres.controllers.NodeController.addNodeVersion()
-GET         /versions/nodes/:id                       edu.berkeley.ground.postgres.controllers.NodeController.getNodeVersion(id: Long)
-GET         /nodes/:sourceKey/latest                  edu.berkeley.ground.postgres.controllers.NodeController.getLatest(sourceKey: String)
-GET         /nodes/:sourceKey/history                 edu.berkeley.ground.postgres.controllers.NodeController.getHistory(sourceKey: String)
+POST        /nodes                                      edu.berkeley.ground.postgres.controllers.NodeController.addNode()
+GET         /nodes/:sourceKey                           edu.berkeley.ground.postgres.controllers.NodeController.getNode(sourceKey: String)
+POST        /versions/nodes                             edu.berkeley.ground.postgres.controllers.NodeController.addNodeVersion()
+GET         /versions/nodes/:id                         edu.berkeley.ground.postgres.controllers.NodeController.getNodeVersion(id: Long)
+GET         /nodes/:sourceKey/latest                    edu.berkeley.ground.postgres.controllers.NodeController.getLatest(sourceKey: String)
+GET         /nodes/:sourceKey/history                   edu.berkeley.ground.postgres.controllers.NodeController.getHistory(sourceKey: String)
+GET         /versions/nodes/adjacent/lineage/:id        edu.berkeley.ground.postgres.controllers.NodeController.getAdjacentLineage(id: Long)
 
 # structure endpoints
-POST        /structures                               edu.berkeley.ground.postgres.controllers.StructureController.addStructure()
-GET         /structures/:sourceKey                    edu.berkeley.ground.postgres.controllers.StructureController.getStructure(sourceKey: String)
-POST        /versions/structures                      edu.berkeley.ground.postgres.controllers.StructureController.addStructureVersion()
-GET         /versions/structures/:id                  edu.berkeley.ground.postgres.controllers.StructureController.getStructureVersion(id: Long)
-GET         /structures/:sourceKey/latest             edu.berkeley.ground.postgres.controllers.StructureController.getLatest(sourceKey: String)
-GET         /structures/:sourceKey/history            edu.berkeley.ground.postgres.controllers.StructureController.getHistory(sourceKey: String)
+POST        /structures                                 edu.berkeley.ground.postgres.controllers.StructureController.addStructure()
+GET         /structures/:sourceKey                      edu.berkeley.ground.postgres.controllers.StructureController.getStructure(sourceKey: String)
+POST        /versions/structures                        edu.berkeley.ground.postgres.controllers.StructureController.addStructureVersion()
+GET         /versions/structures/:id                    edu.berkeley.ground.postgres.controllers.StructureController.getStructureVersion(id: Long)
+GET         /structures/:sourceKey/latest               edu.berkeley.ground.postgres.controllers.StructureController.getLatest(sourceKey: String)
+GET         /structures/:sourceKey/history              edu.berkeley.ground.postgres.controllers.StructureController.getHistory(sourceKey: String)