FIG. 2.

Four aligned genome images showing transcriptional responses of strain NCM3722 after an S downshift (rows 1 and 2) or upshift (rows 3 and 4). Rows 1 and 2, shift from sulfate (green) to glutathione (red); rows 3 and 4, shift from glutathione (green) to sulfate (red). Samples were taken before the shift and 30 min after the shift and were treated as described in the legend to Fig. 1. In each case two prints from the same slide are shown. Easily visible red and green spots are discussed in the text. Note the opposite responses to the S downshift and upshift.