. "Combining with a cytokine and transmitting the signal from one side of the membrane to the other to initiate a change in cell activity." . . "hematopoietin/interferon-class (D200-domain) cytokine receptor activity" . "interleukin receptor activity" . "cytokine receptor activity" . "IL receptor" . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .