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Effect of S-adenosylmethionine (SAM) on growth of the triple mutant. The triple mutant carrying a SAM transporter, E. coli strain MEW999 psamT, was grown in glucose minimal medium, subcultured in the same medium with 0.5% Casamino Acids without SAM (left) and with 2 mM SAM (right) and photographed 6, 8, and 10 hours after subculture.
