create more general concepts pages

content/2.general-concepts/0.index.md

 ---
 title: General Concepts
-toc: true
+toc: False
 layout: article
 ---
 
-
-This section is empty. You can help by adding to it.
\ No newline at end of file

content/2.general-concepts/4.defense-systems_effector.md

+---
+title: Abortive Infection
+layout: article
+toc: true
+---
+
+
+This section is empty. You can help by adding to it.
+
+
+## test article
+

content/2.general-concepts/5.defense-systems-discovery.md

+---
+title: Discovery of defense systems
+layout: article
+toc: true
+---
+
+Defense systems are known since the birth of molecular biology. Then, more were discovered.

content/2.general-concepts/6.defensive-domains.md

+---
+title: Defensive Domains
+layout: article
+toc: true
+---
+
+Among proteins involved in defense systems, a few domains appear to be frequent. 

content/2.general-concepts/7.MGE-defense-systems.md

+---
+title: Defense Systems and MGE
+layout: article
+toc: true
+---
+
+Defense systems help bacteria against mobile genetic elements (MGE), such as phage or plasmids.
+Yet, some defense systems favor certain MGE, or some MGE carry defense systems.
\ No newline at end of file

content/2.general-concepts/8.anti-defense-systems..md

+---
+title: Anti Defense Systems
+layout: article
+toc: true
+---
+
+Anti defense systems are systems that act against defense system, and thus help bypass the defense mechanism.
+