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J. Exp. Med.,
Volume 187, Number 5, March 2, 1998 807-811
By

From the * Wellcome Trust Immunology Unit, Department of Medicine, University of Cambridge
School of Clinical Medicine, Cambridge, England CB2 2SP; the Mice in which the Lyn, Cd22, or Shp-1 gene has been disrupted have hyperactive B cells and
autoantibodies. We find that in the absence of Lyn, the ability of CD22 to become tyrosine
phosphorylated after ligation of mIg, to recruit SHP-1, and to suppress mIg-induced elevation
of intracellular [Ca2+] is lost. Therefore, Lyn is required for the SHP-1-mediated B cell suppressive function of CD22, accounting for similarities in the phenotypes of these mice.
Walter and Eliza Hall Institute of
Medical Research, Royal Melbourne Hospital, Parkville, Victoria 3050, Australia; and the § Ludwig
Institute for Cancer Research, Tumour Biology Branch, Royal Melbourne Hospital, Victoria 3050, Australia
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