Selank is a synthetic peptide derived from the tuftsin peptide family and is widely studied for its effects on neurochemical signaling related to mood regulation, stress response, and sleep quality. In scientific research, Selank is examined for its interaction with neurotransmitter systems, including gamma-aminobutyric acid (GABA) and serotonin pathways, which play key roles in emotional balance and circadian rhythm stability. These properties make Selank a valuable subject in studies focused on behavioral neuroscience and neuroendocrine regulation.