MC intrinsic expression of F/P induces SM. Frequency of viable MCs was analyzed by flow cytometry of c-kit⁺/Fc∈RIα⁺ cells on gated EGFP⁺ or EGFP-negative cells of BM (A) and spleen (B), and of viable CD45⁺/c-kit⁺/Fc∈RIα⁺ cells on gated EGFP⁺ or EGFP⁻ cells of small intestine (C). *P < .05 compared with EGFP-negative MC content. #P < .05 compared with mock vector–transduced (EGFP⁺) MC content. Results are shown as means (± SEM) from 4 mice per group pooled from 2 independent experiments.