Human interleukin-11 (hIL-11) is a pleiotropic cytokine that is involved in numerous biological activities such as hematopoiesis, osteoclastogenesis, neurogenesis and female fertility. IL-11 is obviously a key reagent to study the IL-11 receptors. However, conventional radio-iodination techni-ques lead to a loss of IL-11 bioactivity. Here, we report the construction and the production of a new recombinant human IL-11 (FPDIL-11). In this molecule, a speci®c phosphorylation site (RRASVA) has been introduced at the N-terminus of rhIL-11. .
