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The tryptophan operon in S. enterica, illustrating the three constructed deletions. A series of three deletions (designated by allele numbers) of various portions of the tryptophan operon were introduced into a purF gnd yjgF mutant background (strain DM7436), and the resulting growth phenotypes on media containing gluconate, adenine, and tryptophan in the presence and absence of exogenous thiamine are presented.
