FCER2 and food allergy: In looking for other patterns of APC differentiation in food allergy, we examined the expression of the low-affinity IgE receptor CD23, which plays an important role in regulating IgE production and IgE-mediated immune and inflammatory functions in food allergy (Johnston et al., 2014), and the expression of which is traditionally associated with B cells (Acharya et al., 2010).