Interleukin-15 (IL-15) is a cytokine that possesses a variety of biological functions, including stimulation and maintenance of cellular immune responses [1]. Structurally these proteins are short-chain 4-helical cytokines.

1: Role of IL-15 on monocytic resistance to human herpesvirus 6 infection. Arena A, Merendino RA, Bonina L, Iannello D, Stassi G, Mastroeni P; New Microbiol 2000;23:105-112. PMID:10872679

2: The emerging role of IL-15 in NK-cell development. Liu CC, Perussia B, Young JD; Immunol Today. 2000;21:113-116. PMID:10689297