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The Signal Segment Zap tool provides a means to remove signal wire segments. To "zap" part of a signal wire, activate the Signal Segment Zap tool, position the cursor over the segment you would like to remove, and click the left mouse button. If you are interested in removing an entire signal, rather than a single segment, you can select the signal (use the Selection tool) and press the DELETE key on your keyboard. (Alternatively, you could choose the Delete item from the Edit menu.)