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. 2021 Dec 15;11:168. doi: 10.1186/s13568-021-01330-5

Fig. 3.

Fig. 3

Effect of SpeA, SpeB, and SpeC on putrescine production. A Bacterial cell growth and B putrescine concentration in the supernatant of strains FS123 (speC+, open circle), KN20 (speABC+, closed triangle), and KN24 (speAB+, closed square) grown in LB medium supplemented with 100 μg/mL of ampicillin. When the OD600 reached 0.4, 0.02 mM IPTG was added. Data shown are averages ± standard deviations, and culture experiments were performed in triplicate