Figure 6From: Characterization of protein marker expression, tumorigenicity, and doxorubicin chemoresistance in two new canine mammary tumor cell linesEffects of DOX on DTK-E and DTK-SME cell proliferation. Cells were treated with escalating doses of DOX (1, 10, 100, and 1000 nM) and incubated for 24 h, 48 h, and 72 h. Cell viability was determined every 24 h. Cell numbers were averaged over triplicate samples, and the data are expressed as the mean ± SE.Back to article page