Update gabija.md

Add experimentally validated structure

content/3.defense-systems/gabija.md

@@ -56,6 +56,19 @@ Proportion of genome encoding the Gabija system for the 14 phyla with more than
 
 
 ## Structure
+
+### Experimentaly determined structure
+From :ref{doi=10.1038/s41586-023-06855-2} in *Bacillus cereus* VD045:
+
+::molstar-pdbe-plugin
+---
+height: 700
+dataUrls: 
+    - /gabija/8sm3_BcGajAB_4_4mer.pdb
+    - /gabija/8u7i_BcGajAB_4_4mer_gad1.pdb
+---
+::
+
 ### Gabija
 ##### Example 1