Fig. 5.

Spectrum of the detected peptides (A: 1-day control group in blue and 1-day exposed group in red; and B: 7-day control group in blue and 7-day exposed group in red). Blue arrows indicate control-specific peaks and red arrows indicate tobacco exposure-specific peaks. The vertical axis indicates intensity, and the horizontal axis indicates retention time, which has a linear relationship with the molecular mass of the protein. (For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.)