Figure 2.

Alterations in expression levels of heat shock proteins in WT/radioresistant MCF-7 (a) and MDA-MB-231 (b) cells. The data represent the average ratios obtained from two biological replicates (i.e., one forward and one reverse SILAC labeling experiments). The red and blue bars designate those HSPs that were up- and down-regulated, respectively, by at least 1.5-fold in the radioresistant over the corresponding parental breast cancer cells.