Case study: constructing the working set. The set of extragenic regions upstream genes encoding AcrR BLAST similar proteins has been incorporated to the "working set". For extragenic sequences 8, 10, 13, 16 and 17 the check-box for obtaining the complementary inverted sequence has been marked. Thus, the 17 upstream extragenic sequences are equally oriented with regard to the start points of the genes. Clicking on "FASTA SEQUENCES" button the user obtains the extragenic sequences in FASTA format. Clicking on "PALINSIGHT" button the user sends the sequences to Palinsight viewer.