Antje Chang Maurice Scheer Andreas Grote Ida Schomburg Dietmar Schomburg BRENDA, AMENDA and FRENDA the enzyme information system: new content and tools in 2009. 588-592 2009 37 Nucleic Acids Research Database-Issue http://dx.doi.org/10.1093/nar/gkn820 db/journals/nar/nar37.html#ChangSGSS09