diff --git a/machado/api/serializers.py b/machado/api/serializers.py
index 3d7af28b..c2a9e7f3 100644
--- a/machado/api/serializers.py
+++ b/machado/api/serializers.py
@@ -161,7 +161,7 @@ def get_display(self, obj):
         return obj.get_display()
 
 
-class JBrowseRefseqSerializer(serializers.ModelSerializer):
+class JBrowseRefseqSerializer(serializers.Serializer):
     """JBrowse transcript serializer."""
 
     start = serializers.SerializerMethodField()
diff --git a/machado/api/views.py b/machado/api/views.py
index 1a5970fb..71e07c2a 100644
--- a/machado/api/views.py
+++ b/machado/api/views.py
@@ -193,6 +193,8 @@ def get_queryset(self):
         if sotype is not None:
             queryset = queryset.filter(type__cv__name="sequence", type__name=sotype)
 
+        queryset = queryset.only("seqlen", "uniquename")
+
         return queryset
 
     @method_decorator(cache_page(CACHE_TIMEOUT))