Selank is a synthetic heptapeptide belonging to the class of tuftsin analogs, developed as a structural modification of the endogenous immunomodulatory peptide tuftsin. The substitution of certain amino acids provides Selank with enhanced stability and resistance to enzymatic breakdown, making it suitable for controlled laboratory investigations.

Research on Selank has focused on its potential effects on the central nervous system, particularly in relation to neurotransmitter activity, stress regulation, and gene expression related to neurotrophic factors. Experimental studies have explored its interaction with the GABAergic system and its possible influence on memory, attention, and behavioral responses. In addition, Selank has been studied for its immunological properties, with investigations examining its role in modulating cytokine activity and immune signaling pathways.