Table 2.

Location of nucleotide change between the two wild type strains and the corresponding mutants

Gene	Function	Nucleotide change in mutant 1	Nucleotide change in mutant 2	Amino acid change
mtrB	TRAP, tryptophan regulation	225a → deletion	n.a.	Abolishes stop codon
ykvU	Spore membrane protein	323t → c	n.a.	Ala108Val
yflD	Hypothetical protein	93a → g	n.a.	No amino acid change
trpS	15 bp upstreams the tryptophanyl-tRNA synthase start codon	n.a.	g → a
pyrH	Uridine monophosphate kinase	n.a.	260c → 260a	Asp87Ala

n.a. not applicable