diff --git a/content/3.defense-systems/gao_iet.md b/content/3.defense-systems/gao_iet.md
index a20bf5cdc141ab762437f54623be0c7905cd8714..93753c7c97d6b2070bcdcc7c6cdfa61e5d27c487 100644
--- a/content/3.defense-systems/gao_iet.md
+++ b/content/3.defense-systems/gao_iet.md
@@ -20,7 +20,7 @@ relevantAbstracts:
 
 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}.
+The Iet system is composed of two proteins: IetA (an ATPase) and IetS (a protease) :ref{doi=10.1126/science.aba0372}.
 
 ## Molecular mechanism