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RBL cells were passively sensitized with sera of patients with Bet v 1–mediated birch pollen allergy and concomitant oral allergy syndrome (open symbols) or the serum of a patient with ragweed allergy (solid symbols). Mediator release was triggered by addition of antigen in the presence or absence of IgG isolated from MBC4-immunized rabbits. P values of less than .05 calculated with ANOVA were considered significant. *P < .05 and **P < .01.
