. > Current Issue . > vol. 89 no. 22 . > A L Mui ,??10812 – 10816 . Ligand-induced phosphorylation of the murine interleukin 3 receptor signals its cleavage. A L Mui , . R J Kay , . R K Humphries , and . G Krystal . Terry Fox Laboratory, British Columbia Cancer Research Centre, Vancouver, Canada. . Abstract. The murine interleukin 3 receptor (mIL-3R) is a heterodimer consisting of a 70-kDa alpha subunit and one of two alternative 120-kDa beta subunits ...