A. Flow-cytometry detection of mast cell surface FcεRI expression. Dashed line, isotype control; Grey line, medium alone (Med); bold line, 2μg/ml of IgE (IgE only); thin lines, IgE plus 10μg/ml and 20μg/ml of FAHF-2. B. Messenger levels of FcεRI subunits of MC/9 cells in the presence or absence of anti-DNP IgE with or without FAHF-2. Data are expressed as means ± SD of 3 individual experiments (*p<0.05 vs IgE alone, # # # vs Med alone).