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Transcription ratio of the hdcA gene referred to the reference gene rpoA (gray bars), histamine formation (black bars), and counts (lines) of S. thermophilus PRI60 during growth under the following conditions: skim milk (a), skim milk plus 0.1% (wt/vol) histidine (added after 6 h) (b), thermized (67°C for 20 s) inoculum in skim milk (c), and skim milk plus 2% (wt/vol) NaCl (added after 24 h) (d).
