diff --git a/content/3.defense-systems/butters_gp30_gp31.md b/content/3.defense-systems/butters_gp30_gp31.md
index 1e2afd9633c0b3ca4d7681c38a43a38b19da039d..02076009dff1441b23fb24ccf6bd9784108d36e2 100644
--- a/content/3.defense-systems/butters_gp30_gp31.md
+++ b/content/3.defense-systems/butters_gp30_gp31.md
@@ -30,14 +30,6 @@ However the proteins of this system are predicted as a cytoplasmic protein (gp30
  
 ## Example of genomic structure
 
-TODO
-
-## Distribution of the system among prokaryotes
-
-TODO
-
-## Example of genomic structure
-
 The Butters_gp30_gp31 is composed of 2 proteins: Butters_gp30 and Butters_gp31.
 
 Here is an example found in the RefSeq database: