diff --git a/app/models/genome.rb b/app/models/genome.rb
index b438c55b..47cdc541 100644
--- a/app/models/genome.rb
+++ b/app/models/genome.rb
@@ -183,7 +183,7 @@ def source_extra_biosamples
 
       attr.each do |i|
         @source_extra_biosamples +=
-          i.gsub(/.*: */, '').gsub(/[\.]/, '').split(/ *, (?:and)? */)
+          i.gsub(/.*: */, '').gsub(/[\.]/, '').split(/ *,(?: and)? */)
       end
     end
     @source_extra_biosamples.uniq!