We have not looked much at the IL-4 response so I can't answer that well. The cells express high levels of mRNA for FceRI but the cells express low amounts on the cell surface. One approach that we have tried is to use a low cell density and this seems to increase cell surface expression. I don't know if this will lead to more IgE degranulation. The cells do release b-hex, pgd2 and cyslts when stimulated with PMA so they are capable of releasing mediators.