Figure 4. Growth of M. smegmatis mc²155 in the presence of mitoxantrone or suramin.

A. Bacteria were grown in liquid cultures in the presence of drug for 22 hours, and then plated onto drug-free agar. After a further 48 h the colonies were counted for each concentration of drug. B. Colony counts for bacteria grown in the presence of 0, 13 or 65 µM mitoxantrone for 16, 19 or 22 hours before being plated onto solid media.