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Transcription analysis by Northern blotting of zrfC and aspf2 in the pacCc (AF58) and pacC+/− (AF60) strains grown in either the acid SDA or alkaline SDN medium for 20 h at 37°C, both with a supplement of 100 μM Zn2+ (+) or without a supplement of Zn2+ (−), as indicated at the top of each lane.
