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Tyramine contents in cheonggukjang system added with nicotinic acid at several levels (in situ). (A) Bacillus subtilis KCTC3014 (starter strain) + Enterococcus faecium KCCM12118 (tyramine high producing strain), (B) A + nicotinic acid (B3, TDC inhibitor) 0.10%, (C) A + B3 0.15%, (D) A + B3 0.20%, (E) A + B3 0.25%, (F) A + B3 0.30%. Data are presented as mean ± SD (n = 4). *p < 0.05 compared with 48 h of control cheonggukjang
