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Growth stimulation by norepinephrine. B. bronchiseptica cells were cultured in iron-depleted SS medium (SS) or iron-depleted SS medium containing 30% FBS (SS+FBS), and the growth yield after 20 h was measured densitometrically at a wavelength of 600 nm. Cultures either had no supplementation (solid bars) or were supplemented with either enterobactin (shaded bars), norepinephrine (striped bars), or both enterobactin and norepinephrine (open bars).
