IL-7 is a single-chain 25 kDa protein first identified in bone marrow
cultures through its pre-B cell growth factor properties, then also de
scribed as a potent T-lymphocyte growth factor. This review relates to
the molecular and functional aspects of interleukin-7 (IL-7) and its
receptor (IL-7R). We focused on the role of IL-7 in T-cell activation,
cytotoxicity generation, leukemic cell growth and immunotherapy.