The Times section of the Mundeign Catalogue is concerned with horology and biology. The suprachiasmatic nucleus is a tiny region of the brain in the hypothalamus, situated directly above the optic chiasm. The neuronal and hormonal activities it generates regulate many different body functions in a daily cycle, using around 20,000 neurons. The SCN interacts with many other regions of the brain. It contains several cell types and several different peptides (including vasopressin and vasoactive intestinal peptide) and neurotransmitters. On the other hand you could get a quartz watch from Argos for less than a tenner.
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