The invention relates to the production of proteins and other substances of interest in saliva of transgenic animals, particularly in mammals that produce large quantities of saliva, particularly monogastric ruminants, and ovine, caprine and bovine mammals. The times of arrival of these seismic waves are measured on a detector placed in the well. This logical value is fed back by a frequency comparison loop F2 to bring the frequency of the clock signal CK close to the bit rate of the data signal D without requiring any reference clock signal, thus achieving both broadening of the capture range and extraction of a high-quality clock signal. The members of the multiple control modules are displaced simultaneously in response to pressure on a line connected to each of the control modules.