diff --git a/content/3.defense-systems/gao_iet.md b/content/3.defense-systems/gao_iet.md
index 92f0e5cfb8613aa2c2e0f9999ce973f00c498fd9..1a277ecbebf23e9e56001878249c5a3c2acc6c9e 100644
--- a/content/3.defense-systems/gao_iet.md
+++ b/content/3.defense-systems/gao_iet.md
@@ -13,6 +13,17 @@ tableColumns:
 ---
 
 # Gao_Iet
+
+## Description
+
+Gao_Iet or Iet or IetAS was discovered in 2020 among other defense systems by :ref{doi=10.1126/science.aba0372}.
+
+The Iet system is composed by two protein: IetA (an ATPase) and IetS (a protease) :ref{doi=10.1126/science.aba0372}.
+
+## Molecular mechanism
+
+As far as we are aware, the molecular mechanism is unknown.
+
 ## Example of genomic structure
 
 The Gao_Iet is composed of 2 proteins: IetA and IetS.