Select subsequences. CBrothersSlider.java is a small application written in Java to interactively display gene structures with intron/exon structure and to select subsequences. The interface display clone identifiers (A) and gene images generated "On-the fly" (B). Shifting the sliders (C) or submitting directly chromosome coordinates (D), the user is able to select a subsequence. A small control panel (E) can be used to select only the region on the left of the gene (left checkbox) or on the right of the gene (right checkbox); if both the checkboxes are selected, the application selects only the gene sequence. After sequence manipulation, using the Submit button (F), user can post the selected subsequence coordinates to the main script that generates new FASTA files and display the Results page.