diff --git a/content/3.defense-systems/septu.md b/content/3.defense-systems/septu.md
index 7277766d3231704c71062b47ae5cf9e91c2b973c..d5291d40b2551de4f1237debe5cc8e84f3aa459d 100644
--- a/content/3.defense-systems/septu.md
+++ b/content/3.defense-systems/septu.md
@@ -10,9 +10,27 @@ tableColumns:
     Activator: Unknown
     Effector: Unknown
     PFAM: PF13175, PF13304, PF13476
+contributors: 
+  - Florian Tesson
+relevantAbstracts:
+    - doi: 10.1016/j.cell.2020.09.065
+    - doi: 10.1093/nar/gkab883
+    - doi: 10.1126/science.aar4120
 ---
-
 # Septu
+
+## Description
+The Septu defense system was discovered in 2018 in *Bacillus* :ref{doi=10.1126/science.aar4120}. The name of the system is related to Septu (or Sopdu) the ancient egypt god of the sky and of eastern border regions.
+
+The Septu defense systems is composed of two protein PtuA and PtuB: PtuA encoding for an ATPase (AAA15/AAA21) and PtuB with HNH endonuclease domain.
+
+After the discovery of Septu, two studies discovered separatly another form of Septu :ref{doi=10.1093/nar/gkab883,10.1016/j.cell.2020.09.065}. This new subtype encode a thrid protein with a reverse transcriptase domain. This system is either reffer as Septu Type II :ref{doi=10.1093/nar/gkab883} or as [Retron](/defense-systems/retron) subtype RT-I-A :ref{doi=10.1016/j.cell.2020.09.065,10.1016/j.cell.2020.09.065}.
+
+The Septu defense system is part of large category of system that encode the AAA15/21 ABC ATPase :ref{doi=10.1111/mmi.15074}.
+
+## Molecular mechanism
+As far as we are aware, the molecular mechanism is unknown.
+
 ## Example of genomic structure
 
 The Septu is composed of 2 proteins: PtuA and PtuB.
@@ -101,15 +119,5 @@ end
     style Title3 fill:none,stroke:none,stroke-width:none
     style Title4 fill:none,stroke:none,stroke-width:none
 </mermaid>
-## Relevant abstracts
-
-::relevant-abstracts
----
-items:
-    - doi: 10.1016/j.cell.2020.09.065
-    - doi: 10.1093/nar/gkab883
-    - doi: 10.1126/science.aar4120
 
----
-::