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. 2000 May;68(5):2470–2474. doi: 10.1128/iai.68.5.2470-2474.2000

FIG. 5.

FIG. 5

Tryptophan fluorescence of toxin B at acidic and neutral pH. Toxin B (20 pmol) was dialyzed to pH 4.0 or 7.0, and the tryptophan fluorescence was determined. The fluorescent spectrum of each sample is shown and labeled; each spectrum represents the experimental sample minus background. Similar relative fluorescence was obtained in two consecutive repetitions of this experiment.

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