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Figure 2: Quantitative PCR of bacterial DNA in lymph nodes from patients with sarcoidosis (Sar), tuberculosis (Tbc), and gastric cancer (Cont). The horizontal dotted lines show the detection threshold, and samples with results under this line were considered negative. Biopsy samples from the three patients with sarcoidosis but without P. acnes (as indicated by black dotes) all contained many P. granulosum.