Bowles SL, Jaeger C, Ferrara C, Fingeroth J, Van De Venter M, Oosthuizen V. Comparative binding of soluble fragments (derCD23, sCD23, and exCD23) of recombinant human CD23 to CD21 (SCR 1-2) and native IgE, and their effect on IgE regulation. Cell Immunol. 2011; 271(2):371-8.