FIG. 3.

Northern blots showing the expression of sutA and sutB in P. chrysogenum Wis54-1255 (equal amounts of RNA were loaded [not shown]) (A) and corresponding sulfate uptake levels (B). Wis54-1255 was grown for 24 h in a sulfur-sufficient medium with lactose as the C source, after which the medium was exchanged either for fresh medium of the same composition (+S) or for fresh medium in which all sulfate salts were replaced by chloride salts (−S), and growth was continued for 16 h. dw, dry weight.