The present invention relates to the discovery in eukaryotic cells, particularly mammalian cells, of a family of cell-cycle regulatory proteins. The apparatus includes a processing result prediction unit which predicts a processing result based on the model equation and the sensed data, and a process recipe control unit which compares the predicted processing result with a previously set value to control a processing condition or input parameter. The attenuation profile is a function of sample coordinates and determines attenuation values applied to the samples. The opposing faces of the panel are gripped between the second surface and the catch to retain said mounting component against the vehicle panel. Preferably, the spring arms are integral with a tool housing end cap.