Table 1. Ability of analogues to stimulate transcription from the PqsA promoter and promote pyoverdine production relative to PQS (for 1 and 2, PQS = 100% stimulation) and HHQ (for 3–6, HHQ = 100% stimulation) ^a .

		% Stimulation
		psqA:LacZ promoter	Pyoverdine production
1		103	132
2		13	29
3		27	61
4		40	69
5		–8	47
6		22	39

^aAll assays performed in triplicate; error did not exceed ±10% of the mean.