Fig. 1. The results of drug-induced lymphocyte stimulation tests with methyl paraben (MP), propyl paraben (PP) and carboxymethylcellulose (CMC). The baseline nonallergic lymphocyte stimulation test (= control) was carried out with saline, and this value was regarded as 100%. Results of the drug-induced lymphocyte stimulation test are positive if the stimulation index is more than 180%.