Update abig.md

Add description and no molecular mechanism AbiG #195 (closed) .

content/3.defense-systems/abig.md

@@ -10,13 +10,29 @@ tableColumns:
     Activator: Unknown
     Effector: Unknown
     PFAM: PF10899, PF16873
+contributors:
+  - Florian Tesson
 relevantAbstracts:
     - doi: 10.1023/A:1002027321171
     - doi: 10.1016/j.mib.2005.06.006
+    - doi: 10.1128/aem.62.9.3075-3082.1996
 ---
 
 # AbiG
 
+## Description
+
+AbiG was discovered in 1996 on the plasmid pCI750 of *Lactococcus lactis* :ref{doi=10.1128/aem.62.9.3075-3082.1996}.
+
+AbiG is one of the so-called "Abi" systems for "Abortive infection" discovered in the 90's in research related to the dairy industry :ref{doi=10.1016/j.mib.2005.06.006}. AbiG is classified as abortive infection in :ref{doi=10.1016/j.mib.2023.102312}.
+
+AbiG is composed of two genes AbiGi and AbiGii. 
+
+## Molecular mechanism
+
+As far as we are aware, the molecular mechanism is unknown.
+
+
 ## Example of genomic structure
 
 The AbiG is composed of 2 proteins: AbiGi and AbiGii.