Update eleos.md

issue #265 (closed)

Add ref https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0107211 Add PDB 4AUR

content/3.defense-systems/eleos.md

@@ -48,6 +48,16 @@ Among the 22k complete genomes of RefSeq, this system is present in 2652 genomes
 *Proportion of genome encoding the Eleos system for the 14 phyla with more than 50 genomes in the RefSeq database.* 
 
 ## Structure
+### Experimentaly determined structure
+From :ref{doi=10.1371/journal.pone.0107211} in *Escherichia coli* (ETEC) strain H10407:
+
+::molstar-pdbe-plugin
+
+height: 700
+dataUrl: /radar/4aur_LeoA_1mer.pdb
+::
+
+
 
 ### Eleos