The present invention provides an isolated nucleic acid molecule encoding a PFMSET polypeptide. The model is then scanned in the dentists office using a 3D optical scanner. The display is configured to highlight a portion of the layout associated with a received highlight input, and to update the layout based on a received selection input. The dirt cup assembly defines a cyclonic airflow chamber and includes a wall. In one embodiment, parameters representing the clock model may then be forwarded to other mobile devices to assist in positioning operations.