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Escherichia coli on SMAC agar

Escherichia coli on SMAC agar
Culture of two Escherichia coli strains on sorbitol-MacConkey (SMAC) agar. Most E. coli utilize sorbitol (red colonies on right), but E. coli O157:H7 cannot (colorless colonies on left).
Courtesy of Harriet Provine.
Graphic 82227 Version 4.0