diff --git a/content/3.defense-systems/abig.md b/content/3.defense-systems/abig.md
index 2a8e3c60e1ba1f6eadbc9190e386c1fa7da57862..e4771e5fef27f9f1dbef9a1f01b011757180dabe 100644
--- a/content/3.defense-systems/abig.md
+++ b/content/3.defense-systems/abig.md
@@ -28,7 +28,7 @@ AbiG is one of the so-called "Abi" systems for "Abortive infection" discovered i
 
 AbiG is composed of two genes AbiGi and AbiGii. 
 
-## Molecular mechanism:
+## Molecular mechanism
 
 As far as we are aware, the molecular mechanism is unknown.