Files of restriction enzyme names and their cut sites are stored in disk files. For the format of these files and notes about creating new ones see section Restriction enzyme files.
When the file is read, the list of enzymes is displayed in a scrolling window. To select enzymes press and drag the left mouse button within the list. Dragging the mouse off the bottom of the list will scroll it to allow selection of a range larger than the displayed section of the list. When the left button is pressed any existing selection is cleared. To select several disjoint entries in the list press control and the left mouse button. Once the enzymes have been chosen, pressing OK will create the plot.