diff --git a/tutorials/200_temporal_problem.ipynb b/tutorials/200_temporal_problem.ipynb
index a42253c..befc2fb 100644
--- a/tutorials/200_temporal_problem.ipynb
+++ b/tutorials/200_temporal_problem.ipynb
@@ -1132,23 +1132,13 @@
    "id": "ee9f3b47-d281-49b1-9a71-0b144b72c7e8",
    "metadata": {},
    "source": [
-    "We find that the predicted progenitor population of Fev+ delta cells also specifically expresses *Neurod2*, which suggests that we found a potential transcription factor for both delta and epsilon populations. Thus, we set out to experimentally verify the role of *Neurod2*, and found it to be an activator of epsilon cells {cite}`klein:23`."
+    "We find that the predicted progenitor population of Fev+ delta cells also specifically expresses *Neurod2*, which suggests that we found a potential transcription factor for both delta and epsilon populations. Thus, we set out to experimentally verify the role of *Neurod2*, and found it to be an activator of epsilon cells {cite}`klein:25`."
    ]
   },
   {
-   "cell_type": "code",
-   "execution_count": null,
-   "id": "38f37d74-3384-4bdf-9d0d-e1fe8c8723df",
-   "metadata": {},
-   "outputs": [],
-   "source": []
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "id": "acc281a0-4a36-40ec-8de4-bcf5e110b21e",
+   "cell_type": "markdown",
+   "id": "aabdee51",
    "metadata": {},
-   "outputs": [],
    "source": []
   }
  ],