diff --git a/misc-scripts/xref_mapping/XrefMapper/mus_musculus.pm b/misc-scripts/xref_mapping/XrefMapper/mus_musculus.pm
index 7ba5d5937f4661303fcb41c6ea3bd7e0c212d09d..6aa8899ecb0ebad8586965e60cc335eb3c50f62d 100644
--- a/misc-scripts/xref_mapping/XrefMapper/mus_musculus.pm
+++ b/misc-scripts/xref_mapping/XrefMapper/mus_musculus.pm
@@ -27,6 +27,7 @@ sub gene_description_sources {
 	  "Uniprot/Varsplic", 
 	  "Uniprot/SWISSPROT", 
 	  "MarkerSymbol",
+          "IMGT/GENE-DB",
 	  "RFAM", 
 	  "miRNA_Registry");