Olga V. Kel-Margoulis Aida G. Romashchenko Nikolay A. Kolchanov Edgar Wingender Alexander E. Kel COMPEL: a database on composite regulatory elements providing combinatorial transcriptional regulation. 311-315 2000 28 Nucleic Acids Research 1 db/journals/nar/nar28.html#Kel-MargoulisRKWK00 http://dx.doi.org/10.1093/nar/28.1.311