Reference:
 - Author: Murat Cokol and Rajesh Nair and Burkhard Rost
   Title: 'Finding nuclear localization signals.'
   Journal: EMBO reports
   Volume: 1
   Number: 5
   Pages: 411-415
   Year: 2000
   URL: http://www.nature.com/embor/journal/v1/n5/full/embor546.html
   eprint: http://www.nature.com/embor/journal/v1/n5/pdf/embor546.pdf
   PMID: 11258480
   DOI: 10.1093/embo-reports/kvd092 
